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Equity-Based Compensation - Stock Option & RSU - Narrative (Details) - USD ($)		3 Months Ended		6 Months Ended
	Oct. 08, 2020	Mar. 31, 2026	Mar. 29, 2025	Mar. 31, 2026	Mar. 31, 2026	Mar. 29, 2025	Apr. 20, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, options, grants in period, gross (in shares)		0	0	0		0
Share-based payment arrangement, nonvested award, option, cost not yet recognized, amount		$ 200,000		$ 200,000	$ 200,000
Share-based payment arrangement, nonvested award, cost not yet recognized, period for recognition				10 months 24 days
Share-based payment arrangement, nonvested award, cost not yet recognized, amount		0		$ 0	0
Share-based payment arrangement, expense		10,187,000	$ 0	$ 22,882,000		$ 0
Market and service condition based options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, options, grants in period, gross (in shares)				0		0
Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares authorized (in shares)	341,666
Grants in period, weighted average grant date fair value (in usd per share)	$ 120.00
Options, nonvested, number of shares (in shares)							273,333
Share-based compensation arrangement by share-based payment award, options, vested in period, fair value				$ 1,200,000
Restricted stock units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment arrangement, nonvested award, option, cost not yet recognized, amount		63,700,000		$ 63,700,000	63,700,000
Granted (in shares)				371,167
Equity instruments other than options, vested in period, fair value				$ 16,300,000
Weighted average period				2 years 7 months 6 days
Aggregate intrinsic value		22,500,000		$ 22,500,000	22,500,000
Performance based restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment arrangement, nonvested award, option, cost not yet recognized, amount		6,100,000		6,100,000	$ 6,100,000
Share-based compensation arrangement by share-based payment award, options, vested in period, fair value				$ 5,700,000
Granted (in shares)				129,689	129,689
Share-based payment arrangement, expense		1,900,000		$ 3,100,000
Market and Service Condition Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment arrangement, nonvested award, option, cost not yet recognized, amount		2,700,000		2,700,000	$ 2,700,000
Share-based payment arrangement, expense		$ 300,000		$ 500,000