Net Income Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Jun. 30, 2018	Jul. 01, 2017
Accounting Policies [Abstract]
Net income	$ 27,467	$ 21,809
Denominator:
Denominator for basic net income per common share - weighted-average shares	24,140,778	23,805,138
Effect of dilution due to employee stock options	402,811	384,237
Denominator for diluted net income per common share - adjusted weighted-average shares	24,543,589	24,189,375
Basic net income per common share	$ 1.14	$ 0.92
Diluted net income per common share	$ 1.12	$ 0.90