Schedule II - Valuation and Qualifying Accounts - Schedule of Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Oct. 03, 2015
Allowance for losses on accounts receivable (deducted from the asset to which it relates)
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	$ 2,368	$ 879	$ 1,188
Additions charged to costs and expenses	566	1,492	581
Additions charged to other accounts	0	0	0
Deductions	(1,954)	(3)	(890)
Balance at end of period	980	2,368	879
Valuation allowance on deferred income tax assets (deducted from the asset to which it relates)
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	41,002	58,343	41,935
Additions charged to costs and expenses	20,678	1,121	16,408
Additions charged to other accounts	0	0	0
Deductions	(12)	(18,462)	0
Balance at end of period	$ 61,668	$ 41,002	$ 58,343