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Earnings Per Share and Stock Plans (Narrative) (Details)		3 Months Ended	12 Months Ended
	May 04, 2021 shares	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($) $ / shares shares	Mar. 31, 2022 USD ($) $ / shares shares	Mar. 31, 2021 USD ($) $ / shares shares	Mar. 31, 2020 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount \| $			$ 1,496,000
Common Stock, Shares, Issued			28,611,721	28,517,333
Common Stock, Value, Issued \| $			$ 286,000	$ 285,000
Common shares not included in the computation of diluted loss per share because they were antidilutive			651,000	156,000
Proceeds from issuance of common stock \| $			$ 713,000	$ 2,655,000	$ 1,973,000
Dividend distribution declared per preferred share purchase right \| $			$ 2,005,000
Quarterly dividend rate per share \| $ / shares			$ 0.07
Annual dividend rate per share \| $ / shares			$ 0.28
Stock-based compensation \| $			$ 10,425,000	11,246,000	8,022,000
Stock Repurchase Program, Authorized Amount \| $			20
Payments for Repurchase of Common Stock \| $			$ 1,001,000	0	$ 0
Stock Issued During Period, Shares, New Issues	4,312,500		4,312,500
Treasury Stock, Common, Shares			31,000
Treasury Stock, Value \| $			$ 1,001,000	$ 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			446,720
Weighted- average Exercise Price per share \| $ / shares			$ 31.21
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number			975,171	679,785	657,814	526,794
Weighted-average Exercise Price \| $ / shares			$ 34.54	$ 33.82	$ 27.45	$ 26.53
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term			7 years 1 month 17 days	7 years 29 days	7 years 3 months 14 days	6 years 11 months 4 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			$ 35.26	$ 30.25	$ 25.28
Common shares not included in the computation of diluted loss per share because they were antidilutive			179,000	120,000
Period options generally become exercisable			3 years
Shares of restricted stock that vested during the period				(18,296)	(23,201)
Grant date fair value of shares that vested \| $ / shares				$ 36.43	$ 25.28
Weighted average fair value grant price \| $ / shares			$ 34.49	35.35	29.58	$ 32.36
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			$ 38.15	$ 35.41	$ 34.74
Shares of restricted stock that vested during the period			132,953	(138,407)	(125,150)
Grant date fair value of shares that vested \| $ / shares			$ 35.44	$ 35.71	$ 31.85
Weighted average fair value grant price \| $ / shares			$ 37.02	$ 39.86	$ 32.41	$ 35.20
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			1,100,000
Number of options at the money			693,000
Closing stock price \| $			$ 37.16
Total intrinsic value of stock options exercised \| $			360,000	$ 2,513,000	$ 1,749,000
Fair value of shares that vested (price per share) \| $			10.36	$ 11.19	$ 9.15
Unrecognized compensation cost related to non-vested stock options \| $			$ 3,063,000
Weighted average period of recognition for unrecognized compensation cost			1 year 8 months 12 days
Weighted-average fair value of options \| $ / shares			$ 11.13	$ 17.71	$ 8.46
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			331,000
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			$ 15.16
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 8 months 12 days
Total unrecognized compensation cost related to unvested restricted stock units \| $			$ 3,588,000
Fair value of restricted stock units that vested during the period \| $			4,713,000	$ 4,943,000
Long Term Incentive Plan \| Directors Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense \| $			$ 1,194,000	$ 959,000	$ 540,000
Shares of stock granted under the LTIP to non-executive directors			41,313	21,928	16,209
Weighted average fair value grant price \| $ / shares			$ 28.91	$ 43.73	$ 33.32
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 \| $			$ 10,425,000	$ 11,246,000	$ 8,022,000
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
$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			55,131
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			7 years 9 months 3 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			161,345
Weighted- average Exercise Price per share \| $ / shares			$ 25.08
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number			200,340
Weighted-average Exercise Price \| $ / shares			$ 25.17
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term			5 years 7 months 9 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			166,837
Weighted- average Exercise Price per share \| $ / shares			$ 35.14
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number			490,041
Weighted-average Exercise Price \| $ / shares			$ 33.77
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term			7 years 9 months 10 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, Exercisable, Number			2,122
Weighted- average Exercise Price per share \| $ / shares			$ 49.36
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number			82,181
Weighted-average Exercise Price \| $ / shares			$ 42.77
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term			8 years 11 months 8 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			141,324
Weighted-average Exercise Price \| $ / shares			$ 54.26
Dorner \| Forecast
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Value, New Issues \| $		$ 198,705,000