Revenue Recognition Contract balances (Details) - USD ($)	3 Months Ended
	Jan. 02, 2021	Dec. 28, 2019	Oct. 03, 2020	Sep. 28, 2019
Change in Contract with Customer, Liability [Abstract]
Contract with customer, beginning balance	$ 56,339,000	$ 42,550,000
Additions to customer deposits and deferred revenue	45,694,000	42,633,000
Amount of customer deposits and deferred revenue recognized in income	(42,081,000)	(40,360,000)
Translation adjustments	1,187,000	652,000
Contract with customer, ending balance	61,139,000	45,475,000
Customer deposits	48,119,000	35,894,000	$ 42,715,000	$ 34,538,000
Customer deposits and deferred revenue, noncurrent	$ 13,020,000	$ 9,581,000	$ 13,624,000	$ 8,012,000