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Fair Value Inputs, Attrition Rate for Customer Relationships

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Fair Value Inputs, Engineering Cost Per Hour

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Fair Value Inputs, Royalty Rate

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
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Percentage of assumed long-term growth in revenues, used as an input to measure fair value.

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Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

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Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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The average discount rate applied to insurance contracts to determine future policy benefits to be paid to or on behalf of policyholders.

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Fair Value Measurements (Narratives) (Details)	12 Months Ended
Fair Value Measurements (Narratives) (Details)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($) $ / h	Mar. 31, 2016 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Severance Costs	$ 4,163,000
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	$ 0	$ 1,125,000	$ 0
STB [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Royalty rate		0.30%
STAHL [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted Average Discount Rate, Percent		10.50%
Magnetek [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Royalty rate	2.70%	2.50%
Weighted Average Discount Rate, Percent	10.00%
Unified Industries, Inc. [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Royalty rate		1.30%
AllAcquisitions [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted Average Discount Rate, Percent		11.40%
Fair Value, Measurements, Nonrecurring \| (Level 3) \| STB [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Engineering Cost Per Hour \| $ / h		40.86
Fair Value, Measurements, Nonrecurring \| (Level 3) \| STAHL [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Attrition rate for customer relationships		10.00%
Royalty rate		1.00%
Maximum \| STAHL [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Royalty rate		2.00%
Rest of Products [Member] \| Fair Value, Measurements, Nonrecurring \| (Level 3) \| Goodwill [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average cost per capital (percentage)		10.00%
Annual revenue growth rate for first five years		3.24%
Long term revenue growth rate after five years		3.00%
Duff Norton [Member] \| Fair Value, Measurements, Nonrecurring \| (Level 3) \| Goodwill [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average cost per capital (percentage)		10.20%
Annual revenue growth rate for first five years		3.90%
Long term revenue growth rate after five years		3.50%
Accrued Liabilities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Severance Costs	$ 1,809,000