Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Jun. 26, 2020	Mar. 27, 2020	Dec. 27, 2019	Jun. 28, 2019	Mar. 29, 2019	Dec. 28, 2018	Jun. 26, 2020	Jun. 28, 2019
Numerator:
Net income	$ 24,078	$ 39,193	$ 34,790	$ 36,550	$ 29,555	$ 26,949	$ 98,061	$ 93,054
Less: Undistributed earnings allocated to participating securities	519			996			2,221	2,499
Net income available to common shareholders	$ 23,559			$ 35,554			$ 95,840	$ 90,555
Denominator:
Basic weighted average common shares outstanding (in shares)	47,207			46,386			47,247	46,481
Effect of dilutive securities: Non-participating employee stock options (in shares)	612			1,171			842	1,254
Diluted weighted average common shares outstanding (in shares)	47,819			47,557			48,089	47,735
Basic earnings per share (in dollars per share)	$ 0.50			$ 0.77			$ 2.03	$ 1.95
Diluted earnings per share (in dollars per share)	$ 0.49			$ 0.75			$ 1.99	$ 1.90