v3.21.2

Leases, Codification Topic 842 (Details) - USD ($)	12 Months Ended
Leases, Codification Topic 842 (Details) - USD ($)	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Lessee, Lease, Description [Line Items]
Operating Lease, Expense	$ 27,200,000	$ 27,800,000
Variable Lease, Cost	11,900,000	11,500,000
Lease, Cost	$ 39,100,000	$ 39,300,000
Operating Lease, Weighted Average Discount Rate, Percent	3.14%	3.30%
Operating Lease, Weighted Average Remaining Lease Term	4 years 4 months 28 days	4 years 5 months 23 days
Operating Lease, Payments	$ 27,000,000.0	$ 27.6
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	18,200,000	16.6
Lessee, Operating Lease, Liability, Payments, Due Next Rolling Twelve Months	24,600,000
Lessee, Operating Lease, Liability, to be Paid, Year Two	18,900,000
Lessee, Operating Lease, Liability, to be Paid, Year Three	12,500,000		$ 15,700,000
Lessee, Operating Lease, Liability, to be Paid, Year Four	8,200,000		11,100,000
Lessee, Operating Lease, Liability, to be Paid, Year Five	6,300,000		6,400,000
Lessee, Operating Lease, Liability, to be Paid, after Year Five	8,700,000		14,600,000
Lessee, Operating Lease, Liability, to be Paid	79,200,000
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(5,900,000)
Operating Lease, Liability	73,300,000
Operating Leases, Future Minimum Payments Receivable	47,800,000
Operating Leases, Rent Expense			$ 39,800,000
Other Current Liabilities [Member]
Lessee, Lease, Description [Line Items]
Operating Lease, Liability, Current	22,700,000	22,800,000
Other Assets [Member]
Lessee, Lease, Description [Line Items]
Operating Lease, Right-of-Use Asset	68,500,000	72,300,000
Other Liabilities
Lessee, Lease, Description [Line Items]
Operating Lease, Liability, Noncurrent	$ 50,600,000	$ 54,400,000
Minimum [Member]
Lessee, Lease, Description [Line Items]
Lessor, Operating Lease, Term of Contract	1 year
Maximum [Member]
Lessee, Lease, Description [Line Items]
Lessor, Operating Lease, Term of Contract	8 years

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of lease cost recognized by lessee for lease contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Amount of lessee's undiscounted obligation for lease payment for operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918701-209980

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Balance Type:	credit
Period Type:	instant

- Definition

Amount of lessee's undiscounted obligation for lease payment for operating lease due after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

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Namespace Prefix:	us-gaap_
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- Definition

Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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- Definition

Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

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- Definition

Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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- Definition

Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

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- Definition

Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for operating lease.

+ References

+ Details

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- Definition

Term of lessor's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Section 50
-Paragraph 3
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- Definition

Amount of operating lease expense. Excludes sublease income.

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Period Type:	duration

- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

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- Definition

Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.

+ References

+ Details

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- Definition

Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent.

+ References

+ Details

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- Definition

Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

+ References

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- Definition

Amount of lessee's right to use underlying asset under operating lease.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Weighted average discount rate for operating lease calculated at point in time.

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- Definition

Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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- Definition

Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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- Definition

Future minimum rental payments in aggregate as of the balance sheet date under operating leases.

+ References

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- Definition

Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

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- Definition

Amount of variable lease cost, excluded from lease liability, recognized when obligation for payment is incurred for finance and operating leases.

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