Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2018	Mar. 31, 2018
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 1,252	$ 1,326
Intangible assets, accumulated amortization	$ 41,243	$ 38,880
Preferred stock, par value (in dollars per share)	$ .01	$ .01
Preferred stock, authorized	10,000,000	10,000,000
Preferred stock, issued	0	0
Preferred stock, outstanding	0	0
Common stock, par value (in dollars per share)	$ .01	$ .01
Common stock, authorized	60,000,000	60,000,000
Common stock, issued	25,311,181	25,123,694
Common stock, outstanding	24,227,591	24,105,029
Treasury stock, shares	725,552	713,687