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Earnings per Share and Stock Plans - Narrative (Details) | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2019 shares | Mar. 31, 2024 USD ($) $ / shares shares | Mar. 31, 2023 USD ($) $ / shares shares | Mar. 31, 2022 USD ($) $ / shares shares | May 13, 2024 USD ($) | Mar. 18, 2024 $ / shares | Mar. 31, 2021 $ / 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) | shares |  | 479,000 | 651,000 |  |  |  |  |
Treasury stock (in shares) | shares |  |  | 31,000 |  |  |  |  |
Treasury stock, value |  |  | $ 1,001,000 |  |  |  |  |
Share-based payment arrangement, amount |  | $ 2,825,000 |  |  |  |  |  |
Quarterly dividend rate (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.07 |  |
Annual dividend rate (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.28 |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  | $ 20,000,000
Payments for repurchase of common stock |  | $ 0 | 1,001,000 | $ 0 |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Dividend distribution declared per preferred share purchase right |  |  |  |  | $ 2,020,000 |  |  |
2016 LTIP |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share-based payment award, number of additional shares authorized (in shares) | shares | 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) | shares |  | 2,500,000 |  |  |  |  |  |
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 |  | $ 12,039,000 | $ 10,425,000 | $ 11,246,000 |  |  |  |
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) | shares |  | 165,000 | 179,000 |  |  |  |  |
Period options generally become exercisable |  | 3 years |  |  |  |  |  |
Weighted average fair value grant price (in dollars per share) | $ / shares |  | $ 36.13 | $ 34.49 | $ 35.35 |  |  | $ 29.58 |
ESOP Debt Guarantee |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Weighted-average exercise price (in dollars per share) | $ / shares |  | $ 35.37 | $ 34.54 | $ 33.82 |  |  | $ 27.45 |
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) | shares |  | 339,000 |  |  |  |  |  |
Vesting percentage |  | 33.00% |  |  |  |  |  |
Period options generally become exercisable |  | 3 years |  |  |  |  |  |
Share based compensation, exercise price, percent of fair market value |  | 1 |  |  |  |  |  |
Number of options outstanding, in-the-money (in shares) | shares |  | 1,048,000 |  |  |  |  |  |
Number of options, exercisable, in-the-money | shares |  | 499,000 |  |  |  |  |  |
Closing stock price (in dollars per share) | $ / shares |  | $ 44.63 |  |  |  |  |  |
Total intrinsic value of stock options exercised |  | $ 870,000 | $ 360,000 | $ 2,513,000 |  |  |  |
Grant date fair value of options that vested (in dollars per share) | $ / shares |  | $ 11.00 | $ 10.36 | $ 11.19 |  |  |  |
Unrecognized compensation cost related to non-vested stock options |  | $ 3,277,000 |  |  |  |  |  |
Weighted average period of recognition for unrecognized compensation cost |  | 2 years |  |  |  |  |  |
Weighted-average fair value of options (in dollars per share) | $ / shares |  | $ 12.97 | $ 11.13 | $ 17.71 |  |  |  |
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 |  |  |  |  |  |
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 |  | $ 38.70 |  |  |  |  |  |
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) | shares |  | 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 8 months 12 days |  |  |  |  |  |
Total unrecognized compensation cost related to unvested restricted stock units |  | $ 2,996,000 |  |  |  |  |  |
Fair value of restricted stock units that vested during the period |  | $ 5,720,000 | $ 4,713,000 |  |  |  |  |
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 |  | $ 1,174,000 | $ 1,194,000 | $ 959,000 |  |  |  |
Shares of stock granted under the LTIP to non-executive directors (in shares) | shares |  | 28,512 | 41,313 | 21,928 |  |  |  |
Weighted average fair value grant price (in dollars per share) | $ / shares |  | $ 41.17 | $ 28.91 | $ 43.73 |  |  |  |

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