FAIR VALUE MEASUREMENTS - Estimated Fair Value of Financial Instruments Not Carried at Fair Value (Details) - USD ($) $ in Thousands	Dec. 24, 2021	Sep. 30, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	$ 758,924	$ 758,386
Secured Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	773,000	773,000
Fair Value	782,465	787,314
Secured Debt | Senior Secured Term Loan Facility due May 26, 2028
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	373,000	373,000
Fair Value	371,601	371,486
Secured Debt | Senior Notes due June 2031
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	400,000	400,000
Fair Value	$ 410,864	$ 415,828