Income Taxes - Schedule of Components of Net Deferred Income Tax Asset (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Oct. 01, 2016
Deferred income tax assets:
Loss/credit carryforwards	$ 44,831	$ 24,017
Inventories	7,710	7,527
Accrued benefits	25,811	25,493
Allowance for bad debts	319	461
Other	2,732	2,822
Total gross deferred income tax assets	81,403	60,320
Less valuation allowances	(61,668)	(41,002)
Deferred income tax assets	19,735	19,318
Deferred income tax liabilities:
Property, plant and equipment	14,443	14,400
Other	0	84
Deferred income tax liabilities	14,443	14,484
Net deferred income tax assets	$ 5,292	$ 4,834