Income Taxes (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 31, 2016	Mar. 28, 2020	Mar. 30, 2019	Mar. 28, 2020	Mar. 30, 2019	Sep. 30, 2019
Income Tax Disclosure [Line Items]
Effective income tax rate		55.00%	(30.00%)	(22.00%)	(73.00%)
Income before income taxes		$ 15,778	$ (33,420)	$ 34,809	$ (12,998)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent				21.00%
Reduction of valuation allowance				$ 21,200	$ 1,800
Unrecognized tax benefits		13,200		13,200		$ 11,500
Income tax provision upon recognition of unrecognized tax benefit		13,200		13,200
Unrecognized tax benefits that would impact valuation allowance		6,300		6,300
Potentail reduction in unrecognized tax benefits and accrued interest over next 12 months		$ (500)		$ (500)
Additional Exposure [Member] | KOREA, REPUBLIC OF
Income Tax Disclosure [Line Items]
Income tax examination, estimate of possible loss	$ 12,000					$ 13,000