Cost Method Investment and Collaborative Arrangement (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended		12 Months Ended		45 Months Ended
	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Oct. 01, 2016	Sep. 29, 2018	Sep. 30, 2017	Dec. 28, 2019	Jan. 02, 2016	Sep. 29, 2018
Schedule of Investments [Line Items]
Investment made during fiscal year						$ 1,000				$ 5,000
Ownership interest percentage										22.70%
Gross investments amount						$ 6,000
Decrease of cost method investment											$ (4,000)
Cost method investments		$ 2,000					$ 2,000				2,000
Maximum loss exposure amount		5,300					5,300				5,300
Cost method investments, fair value		2,000					2,000				2,000
Prepaid royalties		3,300					3,300				$ 3,300
Impairment of cost-method investment		300			$ 200		$ 266	$ 692
Payments for royalties		$ 900	$ 900	$ 900
Forecast
Schedule of Investments [Line Items]
Payments for royalties	$ 875								$ 5,000