Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($)			12 Months Ended
	Jun. 26, 2023	Jun. 02, 2020	Sep. 30, 2023	Sep. 30, 2022	Oct. 01, 2022
Debt Instrument [Line Items]
Principal			$ 297,500,000	$ 285,938,000
Unamortized discount			(3,796,000)	(12,574,000)
Deferred issuance costs			(17,753,000)	(2,990,000)
Total debt			275,951,000	270,374,000
Less: current portion of long-term debt				(10,938,000)
Total long-term debt			$ 275,951,000	$ 259,436,000	$ 270,430,000
3.00% Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Maturity date		Jun. 01, 2025	Jun. 01, 2025	Jun. 01, 2025
Convertible debt coupon rate		3.00%	3.00%	3.00%
Effective interest rate			3.70%	6.29%
Principal		$ 175,000,000	$ 87,500,000	$ 175,000,000
Unamortized discount				(11,264,000)
Deferred issuance costs			(992,000)	(2,832,000)
Total debt			86,508,000	$ 160,904,000
Total long-term debt			$ 155,722,000
1.50% Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Maturity date			Jul. 01, 2028
Convertible debt coupon rate			1.50%
Effective interest rate			8.75%
Principal			$ 87,500,000
Unamortized discount			(3,796,000)
Deferred issuance costs			(14,490,000)
Total debt			$ 69,214,000
1.50% Convertible Senior Notes Due 2028
Debt Instrument [Line Items]
Maturity date	Jul. 01, 2028		Jul. 01, 2028
Convertible debt coupon rate	1.50%		1.50%
Effective interest rate			1.91%
Principal	$ 190,000,000		$ 122,500,000
Deferred issuance costs			(2,271,000)
Total debt			120,229,000
Total long-term debt			$ 120,229,000
Senior Credit Facilities
Debt Instrument [Line Items]
Maturity date				Apr. 01, 2025
Effective interest rate				5.37%
Principal				$ 110,938,000
Unamortized discount				(1,310,000)
Deferred issuance costs				(158,000)
Total debt				$ 109,470,000