Business Segment Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Net sales:	$ 839,419	$ 637,123	$ 597,103
Total assets:	1,142,446	1,113,843	772,851
Long-lived assets:	724,277	688,510	397,635
Hoists
Segment Reporting Information [Line Items]
Net sales:	532,925	357,447	351,965
Chain and rigging tools
Segment Reporting Information [Line Items]
Net sales:	79,884	71,832	75,432
Industrial cranes
Segment Reporting Information [Line Items]
Net sales:	35,071	29,151	30,526
Actuators and rotary unions
Segment Reporting Information [Line Items]
Net sales:	71,525	67,468	63,923
Digital Power Control and Delivery Systems [Member]
Segment Reporting Information [Line Items]
Net sales:	84,565	78,660	50,361
Elevator Application Drive Systems [Member]
Segment Reporting Information [Line Items]
Net sales:	24,423	21,998	14,554
Other
Segment Reporting Information [Line Items]
Net sales:	11,026	10,567	10,342
United States
Segment Reporting Information [Line Items]
Net sales:	455,483	408,911	382,923
Total assets:	477,712	474,440	519,168
Long-lived assets:	293,576	301,715	308,504
Europe
Segment Reporting Information [Line Items]
Net sales:	316,694	169,074	151,702
Total assets:	613,842	581,981	199,385
Long-lived assets:	421,183	377,285	78,831
Canada
Segment Reporting Information [Line Items]
Net sales:	20,672	19,718	20,750
Total assets:	7,469	9,825	9,665
Long-lived assets:	1,172	1,156	1,129
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Net sales:	19,082	13,857	14,310
Total assets:	23,630	23,260	21,481
Long-lived assets:	6,847	6,853	7,683
Latin America [Member]
Segment Reporting Information [Line Items]
Net sales:	27,488	25,563	27,418
Total assets:	19,793	24,337	23,152
Long-lived assets:	$ 1,499	$ 1,501	$ 1,488