Stock-Based Compensation - Narrative (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 25, 2022	Dec. 29, 2024	Dec. 31, 2023	Dec. 25, 2022
Stock-Based Compensation [Line Items]
Total pre-tax expense	$ 700,000	$ 21,900,000	$ 17,800,000	$ 10,900,000
Unvested (in shares)			0
Remaining weighted-average vesting period over which pre-tax stock-based compensation expense is expected to be recognized		2 months 1 day
Option, cost not yet recognized		$ 0
Options, vested in period, fair value		$ 800,000	$ 1,400,000	800,000
2022 Long-Term Incentive Plan
Stock-Based Compensation [Line Items]
Number of shares authorized and available for issuance (in shares)		8,500,000
Performance awards
Stock-Based Compensation [Line Items]
Total pre-tax expense		$ 5,700,000	1,200,000	3,200,000
Total grant date fair value		$ 100,000	$ 100,000	$ 1,500,000
Converted (in shares)				245,111
Unvested (in shares)		950,239	402,315
Granted (in shares)		562,587	411,647
Unrecognized pre-tax stock-based compensation expense		$ 9,900,000
Remaining weighted-average vesting period over which pre-tax stock-based compensation expense is expected to be recognized		2 years 1 month 24 days
Weighted average grant date fair value		$ 17.05	$ 9.91	$ 0
Award vesting period		3 years
Restricted stock units
Stock-Based Compensation [Line Items]
Total pre-tax expense		$ 15,800,000	$ 15,600,000	$ 6,200,000
Total grant date fair value		$ 29,500,000	$ 10,600,000	$ 6,100,000
Unvested (in shares)		2,956,748	3,999,319
Granted (in shares)		914,332
Unrecognized pre-tax stock-based compensation expense		$ 18,200,000
Remaining weighted-average vesting period over which pre-tax stock-based compensation expense is expected to be recognized		1 year 8 months 26 days
Weighted average grant date fair value		$ 17.58	$ 10.28	$ 7.88
Award vesting period		3 years
Restricted stock units \| Share-Based Payment Arrangement, Tranche One
Stock-Based Compensation [Line Items]
Award vesting rights, percentage		33.33%
Restricted stock units \| Share-Based Payment Arrangement, Tranche Two
Stock-Based Compensation [Line Items]
Award vesting rights, percentage		33.33%
Restricted stock units \| Share-Based Payment Arrangement, Tranche Three
Stock-Based Compensation [Line Items]
Award vesting rights, percentage		33.33%
Stock option awards
Stock-Based Compensation [Line Items]
Total pre-tax expense		$ 400,000	$ 1,000,000.0	$ 1,500,000
Award vesting period		3 years
Maturity period		10 years

MasterBrand, Inc. 10-K