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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 |  |  |

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