UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - 6 months ended Sep. 30, 2016 - 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, 2016	$ 132	$ 117,511	$ (129,518)	$ 331,224	$ (471)	$ 318,878
Balance (in shares) at Mar. 31, 2016	7,365					7,365
Issuance of restricted stock awards	$ 1	0	0	0	0	$ 1
Issuance of restricted stock awards (in shares)	73
Share-based compensation	$ 0	2,903	0	0	0	2,903
Share-based compensation (in shares)	0
Repurchase of common stock	$ 0	0	(29,430)	0	0	(29,430)
Repurchase of common stock (in shares)	(358)
Net earnings	$ 0	0	0	27,446	0	27,446
Foreign currency translation adjustment	0	0	0	0	(95)	(95)
Balance at Sep. 30, 2016	$ 133	$ 120,414	$ (158,948)	$ 358,670	$ (566)	$ 319,703
Balance (in shares) at Sep. 30, 2016	7,080					7,080