Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended
Dec. 27, 2020	Dec. 29, 2019	Sep. 27, 2020
Related Party Transactions [Abstract]
Related party revenues	$ 22,000	$ 29,000
Accounts receivable, net	27,707		$ 20,884
Contract assets	4,589		3,261
Contract liabilities	$ 2,297		$ 478

For an unclassified balance sheet, amount of receivables arising from transactions with related parties.

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Name:	us-gaap_AccountsReceivableRelatedParties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant