Revenue Recognition - Summary of Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 26, 2021	Sep. 25, 2020
Revenue from Contract with Customer [Abstract]
Accounts receivable, net	$ 283,505	$ 180,340
Contract assets, net	233,379	161,357
Contract liabilities	20,029	15,436
Non-current contract liabilities	23,369	$ 24,342
Change ($)
Accounts receivable, net	103,165
Contract assets, net	72,022
Contract liabilities - current	4,593
Contract liabilities - non-current	$ (973)
Change (%)
Accounts receivable, net	57.00%
Contract assets, net	45.00%
Contract liabilities - current	30.00%
Contract liabilities - non-current	(4.00%)