Accounting Principles and Practices (Details) - USD ($) $ in Thousands	12 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at beginning of year	$ 1,229	$ 655
Accrual for warranties issued	1,988	2,618
Warranties settled	2,084	(2,420)
Extended Product Warranty Accrual, Additions from Business Acquisition	0
Balance at end of year	4,081	1,229
STAHL [Member]
Movement in Standard Product Warranty Accrual [Roll Forward]
Extended Product Warranty Accrual, Additions from Business Acquisition	$ 2,948
Magnetek [Member]
Movement in Standard Product Warranty Accrual [Roll Forward]
Extended Product Warranty Accrual, Additions from Business Acquisition		$ 376

Liability for an extended product warranty acquired in a business acquisition. Does not include any liability for a standard warranty acquired in a business acquisition.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (c)(5)
-URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.15(5))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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- Definition

Amount of decrease in the standard and extended product warranty accrual from payments made in cash or in kind to satisfy claims under the terms of the standard and extended product warranty.

+ References

+ Details

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- Definition

Amount of increase in the standard and extended product warranty accrual from warranties issued.

+ References

+ Details

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- Details

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- Details

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