Business Segment Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Net sales:	$ 637,123	$ 597,103	$ 579,643
Total assets:	1,113,843	772,851	566,324
Long-lived assets:	688,510	397,635	231,692
Hoists
Segment Reporting Information [Line Items]
Net sales:	357,447	351,965	393,571
Chain and rigging tools
Segment Reporting Information [Line Items]
Net sales:	71,832	75,432	76,604
Industrial cranes
Segment Reporting Information [Line Items]
Net sales:	29,151	30,526	26,595
Actuators and rotary unions
Segment Reporting Information [Line Items]
Net sales:	67,468	63,923	72,021
Digital Power Control and Delivery Systems [Member]
Segment Reporting Information [Line Items]
Net sales:	78,660	50,361
Elevator Application Drive Systems [Member]
Segment Reporting Information [Line Items]
Net sales:	21,998	14,554
Other
Segment Reporting Information [Line Items]
Net sales:	10,567	10,342	10,852
United States
Segment Reporting Information [Line Items]
Net sales:	408,911	382,923	345,244
Total assets:	474,440	519,168	304,888
Long-lived assets:	301,715	308,504	142,241
Europe
Segment Reporting Information [Line Items]
Net sales:	169,074	151,702	161,620
Total assets:	581,981	199,385	208,015
Long-lived assets:	377,285	78,831	79,496
Canada
Segment Reporting Information [Line Items]
Net sales:	19,718	20,750	21,731
Total assets:	9,825	9,665	8,055
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Net sales:	13,857	14,310	15,527
Total assets:	23,260	21,481	23,613
Long-lived assets:	6,853	7,683	8,376
Latin America [Member]
Segment Reporting Information [Line Items]
Net sales:	25,563	27,418	35,521
Total assets:	24,337	23,152	21,753
Long-lived assets:	1,501	1,488	1,579
LIQUIDNET CANADA ATS [Member]
Segment Reporting Information [Line Items]
Long-lived assets:	$ 1,156	$ 1,129	$ 0