Leases - Supplemental Balance Sheet and Other Information (Details) - USD ($) $ in Thousands	Mar. 28, 2021	Sep. 27, 2020
Operating leases:
Right-of-use assets	$ 222,922	$ 239,396
Lease liabilities:
Current	68,941	69,650
Long-term	179,645	191,955
Total operating lease liabilities	$ 248,586	$ 261,605
Weighted-average remaining lease term:
Operating leases	5 years	5 years
Weighted-average discount rate:
Operating leases	2.40%	2.50%