Earnings Per Share - Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Dec. 30, 2017	Dec. 24, 2016
Basic EPS:
Net income available to common shareholders	$ 26,247	$ 7,637
Weighted average shares, basic (in shares)	50,730	49,665
Earnings per share, basic (in dollars per share)	$ 0.52	$ 0.15
Diluted EPS
Net income available to common shareholders	$ 26,247	$ 7,637
Weighted average shares, diluted (in shares)	52,695	51,810
Earnings per share, diluted (in dollars per share)	$ 0.50	$ 0.15
Options to purchase common stock
Effect of dilutive securities:
Effective of dilutive securities (in shares)	1,147	1,356
Effect of dilutive securities (in dollars per share)	$ (0.01)	$ 0.00
Restricted shares
Effect of dilutive securities:
Effective of dilutive securities (in shares)	818	789
Effect of dilutive securities (in dollars per share)	$ (0.01)	$ 0.00