Income Taxes - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Oct. 03, 2021	Oct. 03, 2021	Sep. 27, 2020	Sep. 29, 2019	Sep. 30, 2018
Operating Loss Carryforwards [Line Items]
Effective tax rate		12.80%	23.70%	9.30%
Reduction in income tax expense due to excess tax benefits on share-based payments		$ 12,900	$ 8,300	$ 6,400
Effective tax rates, excluding valuation allowance release, non-deductible goodwill impairment charge, transaction costs, and excess tax benefits on share-based payments		25.70%	25.60%	24.60%
Deferred tax liabilities for undistributed foreign earnings	$ 3,136	$ 3,136	$ 0
Undistributed earnings of foreign subsidiaries	50,900	50,900
Valuation allowance	13,040	13,040	24,395
Unrecognized tax benefits	12,899	12,899	9,228	$ 9,169	$ 8,328
Accrual of additional interest and penalties		800	800	2,600
Reduction in accrued interest and penalties		0	0	200
Amount of interest and penalties accrued	5,200	5,200	4,400	$ 3,600
Canada
Operating Loss Carryforwards [Line Items]
Foreign earnings repatriated	80,000
Tax expense related to repatriation of foreign earnings	5,600
Undistributed foreign earnings no longer indefinitely reinvested	20,100	20,100
Deferred tax liabilities for undistributed foreign earnings	3,100	3,100
Foreign
Operating Loss Carryforwards [Line Items]
Tax benefit primarily consisting of valuation allowances	21,600	21,600	$ 22,300
Net operating loss carry forwards which expire at various dates	14,700	14,700
Net operating loss carryforwards	165,500	165,500
Net operating loss carry forwards which have no expiration date	150,800	150,800
Capital loss carryforwards	21,500	21,500
Research and development credits	3,900	3,900
State
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards which expire at various dates	$ 43,700	$ 43,700