STATEMENTS OF CONSOLIDATED STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Retained Deficit	Currency Translation Adjustment	Pensions, Net of Tax	Derivatives, Net of Tax	Noncontrolling Interest
Balance at beginning of period at Mar. 31, 2015	$ 194,064	$ 468,564	$ (211,388)	$ (14,154)	$ (52,232)	$ 0	$ 3,274
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	65,445		65,532				(87)
Acquisition of noncontrolling interest	352						352
Restricted stock surrendered	(157)	(157)
Stock-based compensation	2,423	2,423
Other comprehensive income (loss), net of tax	12,545			108	12,430		7
Balance at end of period at Mar. 31, 2016	274,672	470,830	(145,856)	(14,046)	(39,802)	0	3,546
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(63,271)		(62,928)				(343)
Restricted stock surrendered	(32)	(32)
Stock-based compensation	1,551	1,551
Other comprehensive income (loss), net of tax	(6,210)			(8,247)	3,148	(1,100)	(11)
Balance at end of period at Mar. 31, 2017	206,710	472,349	(208,784)	(22,293)	(36,654)	(1,100)	3,192
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	51,906		52,436				(530)
Acquisition of noncontrolling interest	8,761						8,761
Restricted stock surrendered	(231)	(231)
Stock-based compensation	1,358	1,358
Other comprehensive income (loss), net of tax	14,324			9,611	4,074	1,100	(461)
Balance at end of period at Mar. 31, 2018	$ 282,828	$ 473,476	$ (156,348)	$ (12,682)	$ (32,580)	$ 0	$ 10,962