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Earnings Per Share and Stock Plans (Narrative) (Details) - USD ($)	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 1,335,000
Voting common stock: shares issued	23,771,620	23,391,101
Common Stock, Value, Issued	$ 238,000	$ 234,000
Common shares not included in the computation of diluted loss per share because they were antidilutive	196,000	128,000
Proceeds from issuance of common stock	$ 6,000,000	$ 4,152,000	$ 6,332,000
Dividend distribution declared per preferred share purchase right	$ 1,430,000
Quarterly dividend rate per share	$ 0.06
Annual dividend rate per share	$ 0.24
Stock-based compensation	$ 4,507,000	$ 6,198,000	$ 5,586,000
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	225,337
Weighted- average Exercise Price per share	$ 22.67
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	526,794	834,777	922,450	1,063,894
Weighted-average Exercise Price	$ 26.53	$ 23.52	$ 21.04	$ 19.10
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	6 years 11 months 4 days	7 years 14 days	7 years 6 months 21 days	6 years 11 months 23 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	$ 22.67	$ 22.40	$ 24.94
Common shares not included in the computation of diluted loss per share because they were antidilutive	40,000	153,000
Period options generally become exercisable	3 years
Weighted average fair value grant price	$ 32.36	$ 23.11	19.42	$ 18.92
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	$ 31.61	$ 25.18	$ 17.99
Shares of restricted stock that vested during the period	106,792	211,932	157,448
Grant date fair value of shares that vested	$ 31.09	$ 22.66	$ 20.39
Weighted average fair value grant price	$ 35.20	$ 30.22	$ 22.62	$ 19.32
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	2,500,000
Long Term Incentive Plan \| ESOP Debt Guarantee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grants	3,033,000
Number of options at the money	302,505
Closing stock price	$ 25.00
Total intrinsic value of stock options exercised	5,438,000	$ 3,577,000	$ 5,851,000
Fair value of shares that vested (price per share)	7.43	$ 7.36	$ 7.42
Unrecognized compensation cost related to non-vested stock options	$ 1,961,000
Weighted average period of recognition for unrecognized compensation cost	2 years 7 months 6 days
Weighted-average fair value of options	$ 12.39	$ 13.56	$ 7.66
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	177,251
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
Weighted-average Exercise Price	$ 13.43
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
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 4 months 24 days
Total unrecognized compensation cost related to unvested restricted stock units	$ 4,954,000
Fair value of restricted stock units that vested during the period	3,320,000	$ 4,802,000
Long Term Incentive Plan \| Directors Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	$ 430,000
Shares of stock granted under the LTIP to non-executive directors	11,768	10,031	16,667
Weighted average fair value grant price	$ 39.09	$ 41.88	$ 25.80
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	$ 4,507,000	$ 6,198,000	$ 5,586,000
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%
$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	20,220
Weighted- average Exercise Price per share	$ 38.58
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	196,423
Weighted-average Exercise Price	$ 36.59
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	8 years 7 months 9 days