CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Apr. 01, 2017	Oct. 01, 2016
Consolidated Balance Sheets Parenthetical [Abstract]
Allowance for doubtful accounts and notes receivable	$ 25	$ 506
Preferred stock, without par value (usd per share)	$ 0	$ 0
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Common stock, no par value (usd per share)	$ 0	$ 0
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	83,785,000	83,231,000
Common stock, shares outstanding	70,974,000	70,420,000
Treasury stock, shares	12,811,000	12,811,000