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Dividends Payable, Annual Dividend Rate Amount Per Share

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.

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The per share amount of a dividend declared, but not paid, as of the financial reporting date.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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Unrecognized cost of unvested options awarded to employees as compensation.

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The cash outflow to reacquire common stock during the period.

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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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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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Net number of non-option equity instruments granted to participants.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Percentage of vesting of share-based compensation awards.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Amount of stock repurchase plan authorized.

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Earnings Per Share and Stock Plans (Narrative) (Details) - USD ($)	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 2,051,000
Voting common stock: shares issued	23,391,101	23,045,479
Common Stock, Value, Issued	$ 234,000	$ 230,000
Sale of Stock, Price Per Share			$ 22.00
Common shares not included in the computation of diluted loss per share because they were antidilutive	128,000	340,000
Proceeds from issuance of common stock	$ 4,152,000	$ 6,332,000	$ 50,439,000
Dividend distribution declared per preferred share purchase right	$ 1,405,000
Quarterly dividend rate per share	$ 0.06
Annual dividend rate per share	$ 0.24
Stock-based compensation	$ 6,198,000	$ 5,586,000	$ 5,914,000
Stock Repurchase Program, Authorized Amount	20
Payments for Repurchase of Common Stock	$ 0
ESOP Debt Guarantee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	342,921
Weighted- average Exercise Price per share	$ 20.71
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	834,777	922,450	1,063,894	718,801
Weighted-average Exercise Price	$ 23.52	$ 21.04	$ 19.10	$ 20.13
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	7 years 14 days	7 years 6 months 21 days	6 years 11 months 23 days	6 years 7 months 20 days
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	$ 22.40	$ 24.94	$ 27.12
Common shares not included in the computation of diluted loss per share because they were antidilutive	153,000	127,000
Period options generally become exercisable	3 years
Shares of restricted stock that vested during the period			25,148
Grant date fair value of shares that vested			$ 26.79
Weighted average fair value grant price	$ 23.11	$ 19.42	18.92	$ 26.15
Long Term Incentive Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	$ 25.18	$ 17.99	$ 22.81
Shares of restricted stock that vested during the period	211,932	157,448	162,502
Grant date fair value of shares that vested	$ 22.66	$ 20.39	$ 19.93
Weighted average fair value grant price	$ 30.22	$ 22.62	$ 19.32	$ 20.26
Long Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total number of shares of common stock which may be granted under the plan	2,000,000
Long Term Incentive Plan \| ESOP Debt Guarantee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grants	526,213
Number of options at the money	706,752
Closing stock price	$ 34.35
Total intrinsic value of stock options exercised	3,577,000	$ 5,851,000	$ 252,000
Fair value of shares that vested (price per share)	7.36	$ 7.42	$ 8.56
Unrecognized compensation cost related to non-vested stock options	$ 2,727,000
Weighted average period of recognition for unrecognized compensation cost	2 years 6 months 12 days
Weighted-average fair value of options	$ 13.56	$ 7.66	$ 5.59
Long Term Incentive Plan \| ESOP Debt Guarantee \| ESOP Debt Guarantee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options at the money	341,420
Long Term Incentive Plan \| ESOP Debt Guarantee \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Percent Of Shares Available To Exercise At Year One	$ 0.25
Exercise period from the date options were granted	1 year
Weighted-average Exercise Price	$ 13.27
Long Term Incentive Plan \| ESOP Debt Guarantee \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Percent Of Shares Available To Exercise At Year One	$ 1
Exercise period from the date options were granted	10 years
Weighted-average Exercise Price	$ 38.70
Long Term Incentive Plan \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period of recognition for unrecognized compensation cost	2 years 7 months
Total unrecognized compensation cost related to unvested restricted stock units	$ 4,564,000
Fair value of restricted stock units that vested during the period	4,802,000	$ 3,210,000
Long Term Incentive Plan \| Directors Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	$ 430,000	$ 430,000	$ 430,000
Shares of stock granted under the LTIP to non-executive directors	10,031	16,667	27,960
Weighted average fair value grant price	$ 41.88	$ 25.80	$ 15.74
Long Term Incentive Plan \| Cost of Goods Sold, Selling, and General and Administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	$ 6,198,000	$ 5,586,000	$ 5,914,000
Stock Incentive Plan of Magnetek [Member] \| ESOP Debt Guarantee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grants	164,461
Non Qualified Stock Option Plan \| ESOP Debt Guarantee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period options generally become exercisable	4 years
Shareholders Right Plan \| Directors Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	20.00%
STAHL [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Voting common stock: shares issued			2,273,000
Common Stock, Value, Issued			$ 50,000,000
$30.01 to 40.00 [Member] \| ESOP Debt Guarantee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	1,501
Weighted- average Exercise Price per share	$ 38.70
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	128,025
Weighted-average Exercise Price	$ 38.70
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	9 years 14 days