DEBT - Previous Credit Facilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022	Sep. 26, 2024	Apr. 28, 2022
Debt Instrument [Line Items]
Long-term debt, gross	$ 440,000	$ 594,000
Interest expense, net	56,522	43,575	$ 24,956
Deferred financing cost	3,065	3,996
Line of Credit | Revolving Credit Facility | The Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt, gross		0
Deferred financing cost		700
Aggregate maximum borrowing capacity	150,000
Outstanding letters of credit		2,800
Available borrowing capacity		147,200
Line of credit facility, limit increase option	100,000
Line of credit facility, commitment fee amount	600	600	500
Line of Credit | Revolving Credit Facility | 2024 Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt, gross	0	0		$ 375,000
Deferred financing cost	3,100
Outstanding letters of credit	2,200
Available borrowing capacity	372,800
Line of credit facility, commitment fee amount	10
Line of Credit | Secured Debt | 2022 Term Loan Agreement
Debt Instrument [Line Items]
Debt instrument face amount					$ 600,000
Long-term debt, gross	0	594,000
Interest expense, net			5,100
Write-off of unamortized debt discount and debt issuance costs			500
Third-party costs of debt modification			4,600
Lender fees			4,500
Remaining unamortized debt discount and debt issuance costs			1,800
Third party costs related to term loan amendment			$ 3,400
Deferred financing cost		4,000
Line of Credit | Secured Debt | 2024 Term Loan
Debt Instrument [Line Items]
Debt instrument face amount				$ 440,000
Long-term debt, gross	440,000	$ 0
Interest expense, net	5,500
Write-off of unamortized debt discount and debt issuance costs	700
Third-party costs of debt modification	4,800
Lender fees	1,100
Remaining unamortized debt discount and debt issuance costs	5,900
Deferred financing cost	$ 3,100