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Earnings Per Share and Stock Plans (Narrative) (Details)	3 Months Ended	12 Months Ended
	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($) $ / shares shares	Mar. 31, 2021 USD ($) $ / shares shares	Mar. 31, 2020 USD ($) $ / shares shares	Mar. 31, 2019 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount \| $		$ 1,968,000
Common Stock, Shares, Issued \| shares		28,517,333	23,984,299
Common Stock, Value, Issued \| $		$ 285,000	$ 240,000
Common shares not included in the computation of diluted loss per share because they were antidilutive \| shares		156,000	244,000
Proceeds from issuance of common stock \| $		$ 2,655,000	$ 1,973,000	$ 6,000,000
Dividend distribution declared per preferred share purchase right \| $		$ 2,000,000
Quarterly dividend rate per share \| $ / shares		$ 0.07
Annual dividend rate per share \| $ / shares		$ 0.28
Stock-based compensation \| $		$ 11,246,000	$ 8,022,000	$ 4,507,000
Stock Repurchase Program, Authorized Amount \| $		20
Payments for Repurchase of Common Stock \| $		$ 0
Stock Issued During Period, Shares, New Issues \| shares		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 \| shares		322,218
Weighted- average Exercise Price per share \| $ / shares		$ 26.64
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number \| shares		679,785	657,814	526,794	834,777
Weighted-average Exercise Price \| $ / shares		$ 33.82	$ 27.45	$ 26.53	$ 23.52
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term		7 years 29 days	7 years 3 months 14 days	6 years 11 months 4 days	7 years 14 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 \| $ / shares		$ 30.25	$ 25.28	$ 22.67
Common shares not included in the computation of diluted loss per share because they were antidilutive \| shares		120,000	105,000
Period options generally become exercisable		3 years
Shares of restricted stock that vested during the period \| shares		(18,296)	(23,201)
Grant date fair value of shares that vested \| $ / shares		$ 36.43	$ 25.28
Weighted average fair value grant price \| $ / shares		35.35	29.58	32.36	$ 23.11
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 \| $ / shares		$ 35.41	$ 34.74	$ 31.61
Shares of restricted stock that vested during the period \| shares		(138,407)	(125,150)	(106,792)
Grant date fair value of shares that vested \| $ / shares		$ 35.71	$ 31.85	$ 31.90
Weighted average fair value grant price \| $ / shares		$ 39.86	$ 32.41	$ 35.20	$ 30.22
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 \| shares		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 \| shares		1,799,000
Number of options at the money \| shares		523,000
Closing stock price \| $		$ 42.40
Total intrinsic value of stock options exercised \| $		2,513,000	$ 1,749,000	$ 5,438,000
Fair value of shares that vested (price per share) \| $		11.19	$ 9.15	$ 7.43
Unrecognized compensation cost related to non-vested stock options \| $		$ 2,537,000
Weighted average period of recognition for unrecognized compensation cost		1 year 7 months 6 days
Weighted-average fair value of options \| $ / shares		$ 17.71	$ 8.46	$ 12.39
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 \| shares		321,000
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		0.33	0.33	0.25
Weighted-average Exercise Price \| $ / shares		$ 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	1	1
Weighted-average Exercise Price \| $ / shares		$ 54.26
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		1 year 7 months 6 days
Total unrecognized compensation cost related to unvested restricted stock units \| $		$ 4,724,000
Fair value of restricted stock units that vested during the period \| $		4,943,000	$ 3,986,000
Long Term Incentive Plan \| Directors Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense \| $		$ 959,000	$ 540,000	$ 460,000
Shares of stock granted under the LTIP to non-executive directors \| shares		21,928	16,209	11,768
Weighted average fair value grant price \| $ / shares		$ 43.73	$ 33.32	$ 39.09
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 \| $		$ 11,246,000	$ 8,022,000	$ 4,507,000
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 \| shares		164,461
Dorner \| Forecast
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Value, New Issues \| $	$ 198,705,000
$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 \| shares		1,518
Weighted- average Exercise Price per share \| $ / shares		$ 54.26
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term		9 years 14 days
$20.01 to 30.00 \| 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 \| shares		138,200
Weighted- average Exercise Price per share \| $ / shares		$ 24.93
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number \| shares		235,876
Weighted-average Exercise Price \| $ / shares		$ 25.17
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term		6 years 8 months 8 days
From Thirty Dollar One Cent To Forty Dollar \| 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 \| shares		111,122
Weighted- average Exercise Price per share \| $ / shares		$ 35.73
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number \| shares		216,117
Weighted-average Exercise Price \| $ / shares		$ 34.79
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term		7 years 1 month 2 days
From Forty Dollar One Cent To Fifty Dollar \| ESOP Debt Guarantee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number \| shares		6,365
Weighted-average Exercise Price \| $ / shares		$ 49.36
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term		9 years 1 month 17 days
$50.01 to 60.00 [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, Outstanding, Number \| shares		150,049
Weighted-average Exercise Price \| $ / shares		$ 54.26