Consolidated Successor Company Statement of Shareholder's Equity/ Combined Predecessor Company Statement of Parent Company Equity (USD $) In Millions, unless otherwise specified	Total	Consolidated Successor Company [Member]	Consolidated Successor Company [Member] Common Shares Par Value	Consolidated Successor Company [Member] Additional Paid in Capital	Consolidated Successor Company [Member] Accumulated Deficit	Consolidated Successor Company [Member] Accumulated Other Comprehensive Loss	Combined Predecessor Company [Member]	Combined Predecessor Company [Member] Accumulated Other Comprehensive Loss	Combined Predecessor Company [Member] Parent Company Investment
Balance, Beginning at Sep. 24, 2010							$ 233	$ 21	$ 212
Comprehensive loss:
Net (loss) income							(3)	0	(3)
Foreign currency translation							1	1	0
Change in unrecognized loss related to pension benefit plans							1	1	0
Comprehensive loss							(1)
Net transfers to Parent Company							1	0	1
Balance, Ending at Dec. 22, 2010							233	23	210
Comprehensive loss:
Net (loss) income		(17)	0	0	(17)	0
Foreign currency translation		(6)				(6)
Change in unrecognized loss related to pension benefit plans		(11)				(11)
Comprehensive loss		(34)
Capital Investment of Atkore Group		603		603
Share based compensation		1		1
Balance, Ending at Sep. 30, 2011		570	0	604	(17)	(17)
Comprehensive loss:
Net (loss) income		(8)
Balance, Ending at Dec. 30, 2011
Balance, Beginning at Sep. 30, 2011		570	0	604	(17)	(17)
Comprehensive loss:
Net (loss) income		(8)	0	0	(8)	0
Foreign currency translation		(5)				(5)
Change in unrecognized loss related to pension benefit plans		(6)				(6)
Comprehensive loss		(19)
Share based compensation		1		1
Balance, Ending at Sep. 28, 2012	552	552	0	605	(25)	(28)
Balance, Beginning at Jun. 29, 2012
Comprehensive loss:
Net (loss) income		(1)
Balance, Ending at Sep. 28, 2012	552	552
Comprehensive loss:
Net (loss) income		(4)
Balance, Ending at Dec. 28, 2012
Balance, Beginning at Sep. 28, 2012	552	552	0	605	(25)	(28)
Comprehensive loss:
Net (loss) income		(64)	0	0	(64)	0
Foreign currency translation		13				13
Change in unrecognized loss related to pension benefit plans		13				13
Comprehensive loss		(38)
Share based compensation		2		2
Balance, Ending at Sep. 27, 2013	516	516	0	607	(89)	(2)
Balance, Beginning at Jun. 28, 2013
Comprehensive loss:
Net (loss) income		(28)
Balance, Ending at Sep. 27, 2013	$ 516	$ 516

This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation".

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-Name Statement of Financial Accounting Standard (FAS)

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

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Reference 7: http://www.xbrl.org/2003/role/presentationRef

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+ Details

- Definition

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

+ References+ Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Reference 12: http://www.xbrl.org/2003/role/presentationRef

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Reference 16: http://www.xbrl.org/2003/role/presentationRef

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+ Details

- Definition

Net of tax and reclassification adjustments of the change in the balance sheet adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency of the reporting entity. Also includes the following: gain (loss) on foreign currency forward exchange contracts; foreign currency transactions designated as hedges of net investment in a foreign entity and intercompany foreign currency transactions that are of a long-term nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements; and gain (loss) on a derivative instrument or nonderivative financial instrument that may give rise to a foreign currency transaction gain (loss) that has been designated and qualified as a hedging instrument for hedging of the foreign currency exposure of a net investment in a foreign operation.

+ References+ Details

- Definition

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

+ References+ Details

Atkore International Holdings Inc. 10-K