Supplemental Balance Sheets and Statements of Operations - Other Expenses and Obligations (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Accrued expenses:
Salaries, wages, and related employee costs	$ 62,778	$ 29,589
Interest	396	15,603
Restructuring	8,719	984
Vacation	10,364	7,524
Anti-trust fines and settlements	33,696	0
Other	6,424	4,052
Total accrued expenses	122,377	57,752
Other non-current obligations:
Pension plans	83,495	34,674
Employee separation liability	8,539	8,685
Deferred Compensation Liability, Classified, Noncurrent	5,857	1,774
Anti-trust fines and settlements	35,263	0
Uncertain tax positions	5,704	2,891
Deferred Rent Credit	3,840	0
Return of government subsidies	4,739	0
Purchase Obligation	0	898
Restructuring	1,240	15
Option Valuation Noncurrent	0	9,900
Long-Term Service Contracts Noncurrent	0	339
Other	3,059	955
Total other non-current obligations	151,736	60,131
Other (income) expense, net:
Net foreign exchange (gains) losses	13,145	(3,758)	$ (3,036)
Legal expenses/fines related to anti-trust class actions	9,900	0	0
Post retirement and pension plan non-service costs	210	1,256	1,507
Insurance proceeds	0	(423)	0
(Gain) loss on early extinguishment of debt	486	0	0
Other	(851)	946	(688)
Nonoperating Income (Expense)	$ (24,592)	$ 3,871	$ 841