CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Sep. 30, 2017	Oct. 01, 2016
Consolidated Balance Sheets Parenthetical [Abstract]
Allowance for doubtful accounts and notes receivable	$ 79	$ 506
Preferred stock, without par value (usd per share)	$ 0	$ 0
Preferred stock, shares authorized	5,000	5,000
Preferred stock, shares issued	0	0
Common stock, no par value (usd per share)	$ 0	$ 0
Common stock, shares authorized	200,000	200,000
Common stock, shares issued	83,953	83,231
Common stock, shares outstanding	70,197	70,420
Treasury stock, shares	13,756	12,811