Business Segment Information (Details) - USD ($)	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Revenues	$ 809,162,000	$ 876,282,000	$ 839,419,000
Total assets:	1,093,272,000	1,061,571,000	1,142,446,000
Long-Lived Assets	617,114,000	643,059,000	724,277,000
Chain And Forged Attachments [Member]
Segment Reporting Information [Line Items]
Revenues	68,666,000	89,215,000	79,884,000
Hoists
Segment Reporting Information [Line Items]
Revenues	520,217,000	546,924,000	532,925,000
Industrial cranes
Segment Reporting Information [Line Items]
Revenues	16,058,000	30,967,000	35,071,000
Actuators and rotary unions
Segment Reporting Information [Line Items]
Revenues	77,957,000	77,719,000	71,525,000
Digital Power Control and Delivery Systems [Member]
Segment Reporting Information [Line Items]
Revenues	100,658,000	98,187,000	84,565,000
Elevator Application Drive Systems [Member]
Segment Reporting Information [Line Items]
Revenues	25,606,000	25,548,000	24,423,000
Other
Segment Reporting Information [Line Items]
Revenues	0	7,722,000	11,026,000
United States
Segment Reporting Information [Line Items]
Revenues	450,242,000	485,969,000	455,483,000
Total assets:	518,914,000	496,580,000	477,712,000
Long-Lived Assets	272,816,000	282,456,000	293,576,000
GERMANY
Segment Reporting Information [Line Items]
Revenues	175,492,000	196,055,000	195,807,000
Total assets:	438,210,000	429,859,000	514,244,000
Long-Lived Assets	327,420,000	342,150,000	409,827,000
Europe, Middle East, and Africa (Excluding Germany)
Segment Reporting Information [Line Items]
Revenues	121,600,000	127,453,000	120,887,000
Total assets:	86,638,000	85,680,000	99,598,000
Long-Lived Assets	9,561,000	10,163,000	11,356,000
Canada
Segment Reporting Information [Line Items]
Revenues	21,984,000	22,206,000	20,672,000
Total assets:	9,979,000	8,688,000	7,469,000
Long-Lived Assets	1,192,000	1,319,000	1,172,000
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Revenues	14,193,000	17,749,000	19,082,000
Total assets:	20,314,000	22,129,000	23,630,000
Long-Lived Assets	4,928,000	5,781,000	6,847,000
Latin America [Member]
Segment Reporting Information [Line Items]
Revenues	25,651,000	26,850,000	27,488,000
Total assets:	19,217,000	18,635,000	19,793,000
Long-Lived Assets	$ 1,197,000	1,190,000	$ 1,499,000
Chain and rigging tools | Chain And Forged Attachments [Member]
Segment Reporting Information [Line Items]
Revenues		12,289,000
Chain and rigging tools | Industrial cranes
Segment Reporting Information [Line Items]
Revenues		14,184,000
Chain and rigging tools | Other
Segment Reporting Information [Line Items]
Revenues		$ 7,722,000