Earnings per Share (EPS) and Common Stock (Earnings per Share Basic and Diluted) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 02, 2016	Apr. 04, 2015	Apr. 02, 2016	Apr. 04, 2015
Earnings Per Share and Common Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount			2,069
Net income (loss)	$ (5,173)	$ 5,392	$ (29,065)	$ 35,676
Weighted average shares outstanding—Basic (in shares)	114,563	114,944	114,354	115,147
Dilutive effect of employee stock options, restricted shares and restricted stock units (in shares)		978	0	1,332
Weighted average shares outstanding—Diluted (in shares)	114,563	115,922	114,354	116,479
Earnings(loss) per share—Basic (in USD per share)	$ (0.05)	$ 0.05	$ (0.25)	$ 0.31
Earnings(loss) per share—Diluted (in USD per share)	$ (0.05)	$ 0.05	$ (0.25)	$ 0.31