Goodwill and Intangible Assets (Details) - USD ($)	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible asset	$ 0	$ 1,125,000	$ 0
Goodwill, Impaired, Accumulated Impairment Loss	107,000,000	107,000,000
Goodwill [Roll Forward]
Opening Balance	319,299,000
Acquisition of Hebetechnik (See Note 3)	28,071,000	(1,739,000)
Closing Balance	347,434,000	319,299,000
Gross Carrying Amount	304,628,000	279,197,000
Indefinite-lived trademark	48,874,000	46,018,000
Accumulated Amortization	(40,864,000)	(23,014,000)
Net	263,764,000	256,183,000
Trademark
Goodwill [Roll Forward]
Gross Carrying Amount	5,875,000	5,151,000
Accumulated Amortization	(3,299,000)	(2,616,000)
Net	2,576,000	2,535,000
Customer relationships
Goodwill [Roll Forward]
Gross Carrying Amount	199,045,000	177,983,000
Accumulated Amortization	(27,887,000)	(14,873,000)
Net	171,158,000	163,110,000
Acquired technology
Goodwill [Roll Forward]
Gross Carrying Amount	46,898,000	46,574,000
Accumulated Amortization	(7,436,000)	(4,603,000)
Net	39,462,000	41,971,000
Other
Goodwill [Roll Forward]
Gross Carrying Amount	3,936,000	3,471,000
Accumulated Amortization	(2,242,000)	(922,000)
Net	1,694,000	$ 2,549,000
STB [Member]
Goodwill [Roll Forward]
Acquisition			$ 170,716,000
STAHL [Member]
Finite-Lived Intangible Assets [Line Items]
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles	64,000
Goodwill [Roll Forward]
Acquisition	$ 150,322,000