CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning balance (in shares) at Mar. 31, 2018		30,447,000
Beginning balance at Mar. 31, 2018	$ 940,779	$ 304	$ 167,587	$ 785,871	$ (12,983)
Increase (Decrease) in Stockholders' Equity
Stock compensation expense (in shares)		2,000
Stock compensation expense	3,526		3,526
Shares issued upon vesting (in shares)		6,000
Shares issued upon vesting	0
Shares withheld for taxes	(328)		(328)
Repurchases of common stock (in shares)		(86,000)
Repurchases of common stock	(9,999)	$ 0		(9,999)
Net loss	(30,407)			(30,407)
Total other comprehensive loss	(2,140)				(2,140)
Ending balance (in shares) at Jun. 30, 2018		30,369,000
Ending balance at Jun. 30, 2018	902,151	$ 304	170,785	746,185	(15,123)
Beginning balance (in shares) at Mar. 31, 2019		29,141,000
Beginning balance at Mar. 31, 2019	1,045,130	$ 291	178,227	889,266	(22,654)
Increase (Decrease) in Stockholders' Equity
Stock compensation expense (in shares)		1,000
Stock compensation expense	3,424		3,424
Shares issued upon vesting (in shares)		4,000
Shares issued upon vesting	0
Exercise of stock options (in shares)		46,000
Exercise of stock options	2,773	$ 1	2,772
Shares withheld for taxes	$ (374)		(374)
Repurchases of common stock (in shares)	(226,776)	(227,000)
Repurchases of common stock	$ (35,005)	$ (2)		(35,003)
Net loss	(19,351)			(19,351)
Total other comprehensive loss	(249)				(249)
Ending balance (in shares) at Jun. 30, 2019		28,965,000
Ending balance at Jun. 30, 2019	$ 995,279	$ 290	$ 184,049	$ 833,843	$ (22,903)