Employee Benefits - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2015	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Employer contributions			$ 4,627	$ 4,843	$ 3,978
Estimated future employer contributions in 2017			$ 516
Period of projection			10 years
Reduction in benefit obligation	$ 4,461
Plan settlements			$ 1,454
Special termination benefits			14
Plan curtailments		$ 1,062
Reduction in the benefit obligation and accumulated other comprehensive income		$ (2,534)
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Other postretirement benefit expense			12
Employer contributions			3,607	2,902
Estimated future employer contributions in 2017			3,586
Defined Benefit Plan, Expected Amortization, Next Fiscal Year			971
Plan settlements			0	4,802
Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Employer contributions			2,103	2,868
Estimated future employer contributions in 2017			3,144
Defined Benefit Plan, Expected Amortization, Next Fiscal Year			760
Plan settlements			(9)	123
Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Prior service credits to be amortized from AOCI next year			710
Actuarial net (gains) losses to be amortized from AOCI next year			438
Postretirement Benefits Plan | U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Employer contributions			356	347
Postretirement Benefits Plan | Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Employer contributions			$ 126	$ 102