Net Income Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Dec. 29, 2018	Dec. 30, 2017
Net income per common share:
Net income	$ 16,178	$ 30,111	$ 27,467	$ 23,832	$ 14,823	$ 21,809	$ 73,756	$ 60,464
Denominator:
Denominator for basic net income per common share-weighted-average shares outstanding	24,457,555			23,985,925			24,308,029	23,912,474
Effect of dilution due to employee stock awards	343,092			460,190			384,986	409,691
Denominator for diluted net income per common share - weighted-average shares outstanding	24,800,647			24,446,115			24,693,015	24,322,165
Basic net income per common share (in dollars per share)	$ 0.66			$ 0.99			$ 3.03	$ 2.53
Diluted net income per common share (in dollars per share)	$ 0.65			$ 0.97			$ 2.99	$ 2.49