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Earnings Per Share and Stock Plans (Narrative) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount		$ 2,349,000
Common Stock, Shares, Issued		23,984,299	23,771,620
Common Stock, Value, Issued		$ 240,000	$ 238,000
Common shares not included in the computation of diluted loss per share because they were antidilutive		244,000	196,000
Proceeds from issuance of common stock		$ 1,973,000	$ 6,000,000	$ 4,152,000
Dividend distribution declared per preferred share purchase right		$ 1,440,000
Quarterly dividend rate per share		$ 0.06
Annual dividend rate per share		$ 0.24
Stock-based compensation		$ 8,022,000	$ 4,507,000	$ 6,198,000
Stock Repurchase Program, Authorized Amount		20
Payments for Repurchase of Common Stock		$ 0
Stock Issued During Period, Shares, New Issues		4,312,500
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		268,815
Weighted- average Exercise Price per share		$ 24.41
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number		657,814	526,794	834,777	922,450
Weighted-average Exercise Price		$ 27.45	$ 26.53	$ 23.52	$ 21.04
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term		7 years 3 months 14 days	6 years 11 months 4 days	7 years 14 days	7 years 6 months 21 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		$ 25.28	$ 22.67	$ 22.40
Common shares not included in the computation of diluted loss per share because they were antidilutive		105,000	40,000
Period options generally become exercisable		3 years
Shares of restricted stock that vested during the period		(23,201)
Grant date fair value of shares that vested		$ 25.28
Weighted average fair value grant price		29.58	$ 32.36	23.11	$ 19.42
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		$ 34.74	$ 31.61	$ 25.18
Shares of restricted stock that vested during the period		125,150	106,792	211,932
Grant date fair value of shares that vested		$ 31.85	$ 31.90	$ 22.66
Weighted average fair value grant price		$ 32.41	$ 35.20	$ 30.22	$ 22.62
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		2,252,000
Number of options at the money		657,814
Closing stock price		$ 52.76
Total intrinsic value of stock options exercised		1,749,000	$ 5,438,000	$ 3,577,000
Fair value of shares that vested (price per share)		9.15	$ 7.43	$ 7.36
Unrecognized compensation cost related to non-vested stock options		$ 2,463,000
Weighted average period of recognition for unrecognized compensation cost		2 years
Weighted-average fair value of options		$ 8.46	$ 12.39	$ 13.56
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		268,815
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 1 month 6 days
Total unrecognized compensation cost related to unvested restricted stock units		$ 5,152,000
Fair value of restricted stock units that vested during the period		3,986,000	$ 3,320,000
Long Term Incentive Plan \| Directors Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense		$ 540,000	$ 460,000	$ 430,000
Shares of stock granted under the LTIP to non-executive directors		16,209	11,768	10,031
Weighted average fair value grant price		$ 33.32	$ 39.09	$ 41.88
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		$ 8,022,000	$ 4,507,000	$ 6,198,000
Stock Issued During Period, Value, Restricted Stock Award, Forfeitures		$ 1,981,000
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
Dorner \| Forecast
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Value, New Issues	$ 198,720,000
$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		61,069
Weighted- average Exercise Price per share		$ 37.25
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number		244,335
Weighted-average Exercise Price		$ 35.01
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term		8 years 7 days