UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - 9 months ended Dec. 31, 2018 - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Total
Balance at Mar. 31, 2018	$ 142	$ 130,000	$ (36,016)	$ 277,945	$ 532	$ 372,603
Balance (in shares) at Mar. 31, 2018	13,761					13,761
Issuance of restricted stock awards	$ 1	0	0	0	0	$ 1
Issuance of restricted stock awards (in shares)	75
Share-based compensation	$ 0	5,418	0	0	0	5,418
Repurchase of common stock	0	0	$ (15,883)	0	0	(15,883)
Repurchase of common stock (in shares)			(196)
Net earnings	0	0	$ 0	48,140	0	48,140
Foreign currency translation adjustment	0	0	0	0	(1,102)	(1,102)
Balance at Dec. 31, 2018	$ 143	$ 135,418	$ (51,899)	$ 326,085	$ (570)	$ 409,177
Balance (in shares) at Dec. 31, 2018	13,640					13,640