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Earnings per Share and Stock Plans - Narrative (Details) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |
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Jul. 31, 2024 shares | Jun. 30, 2019 shares | Mar. 31, 2025 USD ($) $ / shares shares | Mar. 31, 2025 USD ($) $ / shares shares | Mar. 31, 2024 USD ($) $ / shares shares | Mar. 31, 2023 USD ($) $ / shares shares | May 12, 2025 USD ($) | Mar. 24, 2025 $ / shares | Mar. 31, 2022 $ / shares | Mar. 26, 2019 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Common shares not included in the computation of diluted loss per share because they were antidilutive (in shares) |  |  |  |  | 479,000 |  |  |  |  |
Share-based payment arrangement, amount | $ |  |  | $ 3,578 | $ 3,578 |  |  |  |  |  |
Dividends declared per common share (in dollars per share) | $ / shares |  |  | $ 0.07 | $ 0.28 | $ 0.28 | $ 0.28 |  |  |  |
Annual dividend rate (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 0.28 |  |
Stock repurchase program, authorized amount | $ |  |  |  |  |  |  |  |  |  | $ 20,000
Treasury stock (in shares) |  |  |  |  |  | 31,000 |  |  |  |
Treasury stock, value | $ |  |  |  |  |  | $ 1,010 |  |  |  |
Additional common shares repurchased (in shares) |  |  |  | 293,000 |  |  |  |  |  |
Common stock aggregate cost | $ |  |  |  | $ 9,945 |  |  |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Common shares not included in the computation of diluted loss per share because they were antidilutive (in shares) |  |  |  | 1,756,000 |  |  |  |  |  |
ESOP Debt Guarantee |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Common shares not included in the computation of diluted loss per share because they were antidilutive (in shares) |  |  |  | 1,756,000 |  |  |  |  |  |
Performance Shares |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Common shares not included in the computation of diluted loss per share because they were antidilutive (in shares) |  |  |  | 1,756,000 |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Dividend distribution declared per preferred share purchase right | $ |  |  |  |  |  |  | $ 2,003 |  |  |
2016 LTIP |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based payment award, number of additional shares authorized (in shares) | 2,800,000 | 2,500,000 |  |  |  |  |  |  |  |
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 (in shares) |  |  | 5,300,000 | 5,300,000 |  |  |  |  |  |
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 | $ |  |  |  | $ 6,256 | $ 12,039 | $ 10,425 |  |  |  |
Performance Shares |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Common shares not included in the computation of diluted loss per share because they were antidilutive (in shares) |  |  |  |  | 165,000 |  |  |  |  |
Weighted average fair value grant price (in dollars per share) | $ / shares |  |  | $ 33.90 | $ 33.90 | $ 36.13 | $ 34.49 |  |  | $ 35.35 |
ESOP Debt Guarantee |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted-average exercise price (in dollars per share) | $ / shares |  |  | $ 36.38 | $ 36.38 | $ 35.37 | $ 34.54 |  |  | $ 33.82 |
ESOP Debt Guarantee | Long Term Incentive Plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares available for future grants (in shares) |  |  | 2,562,000 | 2,562,000 |  |  |  |  |  |
Period options generally become exercisable |  |  |  | 3 years |  |  |  |  |  |
Vesting percentage |  |  |  | 33.00% |  |  |  |  |  |
Share based compensation, exercise price, percent of fair market value |  |  | 1 | 1 |  |  |  |  |  |
Number of options outstanding, in-the-money (in shares) |  |  | 51,957 | 51,957 |  |  |  |  |  |
Number of options, exercisable, in-the-money |  |  | 51,957 | 51,957 |  |  |  |  |  |
Closing stock price (in dollars per share) | $ / shares |  |  | $ 16.70 | $ 16.70 |  |  |  |  |  |
Total intrinsic value of stock options exercised | $ |  |  |  | $ 120 | $ 870 | $ 360 |  |  |  |
Grant date fair value of options that vested (in dollars per share) | $ / shares |  |  |  | $ 11.55 | $ 11.00 | $ 10.36 |  |  |  |
Unrecognized compensation cost related to non-vested stock options | $ |  |  | $ 2,615 | $ 2,615 |  |  |  |  |  |
Weighted average period of recognition for unrecognized compensation cost |  |  |  | 1 year 8 months 12 days |  |  |  |  |  |
Weighted-average fair value of options (in dollars per share) | $ / shares |  |  |  | $ 17.13 | $ 12.97 | $ 11.13 |  |  |  |
ESOP Debt Guarantee | Long Term Incentive Plan | Minimum |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted-average exercise price (in dollars per share) | $ / shares |  |  | $ 15.16 | 15.16 |  |  |  |  |  |
ESOP Debt Guarantee | Long Term Incentive Plan | Maximum |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted-average exercise price (in dollars per share) | $ / shares |  |  | $ 54.26 | $ 54.26 |  |  |  |  |  |
ESOP Debt Guarantee | Stock Incentive Plan of Magnetek |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares available for future grants (in shares) |  |  | 164,461 | 164,461 |  |  |  |  |  |
Restricted Stock | Long Term Incentive Plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted average period of recognition for unrecognized compensation cost |  |  |  | 1 year 9 months 18 days |  |  |  |  |  |
Total unrecognized compensation cost related to unvested restricted stock units | $ |  |  | $ 3,356 | $ 3,356 |  |  |  |  |  |
Fair value of restricted stock units that vested during the period | $ |  |  |  | $ 4,922 | $ 5,720 |  |  |  |  |
Restricted Stock | Long Term Incentive Plan | Share-Based Payment Arrangement, Tranche One |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  | 33.33% |  |  |  |  |  |
Restricted Stock | Long Term Incentive Plan | Share-Based Payment Arrangement, Tranche Three |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  | 33.33% |  |  |  |  |  |
Restricted Stock | Long Term Incentive Plan | Share-Based Payment Arrangement, Tranche Two |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  | 33.33% |  |  |  |  |  |
Directors Stock Plan | Long Term Incentive Plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Stock based compensation expense | $ |  |  |  | $ 1,057 | $ 1,174 | $ 1,194 |  |  |  |
Shares of stock granted under the LTIP to non-executive directors (in shares) |  |  |  | 28,112 | 28,512 | 41,313 |  |  |  |
Weighted average fair value grant price (in dollars per share) | $ / shares |  |  | $ 37.61 | $ 37.61 | $ 41.17 | $ 28.91 |  |  |  |

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