SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS AND RESERVES (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 27, 2020	Sep. 29, 2019	Sep. 30, 2018
Allowance for doubtful accounts
Changes in valuation and qualifying accounts and reserves
Balance at Beginning of Period	$ 10,562	$ 5,188	$ 3,987
Charged to Costs and Expenses	1,472	7,242	1,496
Deductions	(4,887)	(1,868)	(295)
Other	0	0	0
Balance at End of Period	7,147	10,562	5,188
Income tax valuation allowance
Changes in valuation and qualifying accounts and reserves
Balance at Beginning of Period	20,543	21,479	25,326
Charged to Costs and Expenses	3,852	255	900
Deductions	0	(23,714)	0
Other	0	22,523	(4,747)
Balance at End of Period	$ 24,395	$ 20,543	$ 21,479