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Stock-Based Compensation, Stock Options (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Stock Options [Abstract] |  |  |
Stock-based compensation expense | $ 10.8 | $ 6.6 | $ 5.7
Stock Options [Member] |  |  |
Stock Options [Abstract] |  |  |
Stock-based compensation expense | 1.0 | 1.2 | 1.1
Fair value of awards vesting | 1.2 | $ 1.0 | $ 0.9
Unrecognized compensation costs | $ 1.1 |  |
Weighted average period recognized | 1 year 2 months 12 days |  |
Assumptions for Stock Awards Granted [Abstract] |  |  |
Fair value of options (in dollars per share) |  | $ 6.99 | $ 8.79
Expected life of awards in years |  | 6 years | 6 years 1 month 6 days
Risk-free interest rate |  | 3.00% | 1.10%
Expected volatility of the Company's stock |  | 57.80% | 56.50%
Expected dividend yield on the Company's stock |  | 0.00% | 0.00%
Award vesting period |  | 3 years | 4 years
Stock Options Activity [Rollforward] |  |  |
Outstanding, beginning of year (in shares) | 0.9 |  |
Granted (in shares) | 0.0 |  |
Exercised (in shares) | (0.2) |  |
Forfeited or expired (in shares) | (0.1) |  |
Outstanding, end of year (in shares) | 0.6 | 0.9 |
Exercisable, end of year (in shares) | 0.4 |  |
Weighted Average Exercise Price [Rollforward] |  |  |
Outstanding, beginning of year (in dollars per share) | $ 12.28 |  |
Granted (in dollars per share) | 0 |  |
Exercised (in dollars per share) | 11.08 |  |
Forfeited or expired (in dollars per share) | 11.13 |  |
Outstanding, end of year (in dollars per share) | 12.78 | $ 12.28 |
Exercisable, end of year (in dollars per share) | $ 13 |  |
Weighted-Average Remaining Contractual Term [Abstract] |  |  |
Weighted average remaining contractual term, outstanding at end of year | 6 years 8 months 12 days |  |
Weighted average remaining contractual term, exercisable at end of year | 6 years 2 months 12 days |  |
Aggregate Intrinsic Value [Abstract] |  |  |
Aggregate intrinsic value, outstanding at end of year | $ 51.9 |  |
Aggregate intrinsic value, exercisable at end of year | 29.8 |  |
Additional Information Related to Stock Options Exercised [Abstract] |  |  |
Intrinsic value of stock options exercised | 12.4 | $ 1.5 | $ 0.1
Proceeds from stock options exercised | $ 2.6 | $ 2.9 | $ 1.4
Stock Options [Member] | Maximum [Member] |  |  |
Assumptions for Stock Awards Granted [Abstract] |  |  |
Stock option term | 10 years |  |
Stock Options [Member] | Tranche One [Member] |  |  |
Assumptions for Stock Awards Granted [Abstract] |  |  |
Annual vesting percentage |  | 33.00% | 25.00%
Stock Options [Member] | Tranche Two [Member] |  |  |
Assumptions for Stock Awards Granted [Abstract] |  |  |
Annual vesting percentage |  | 33.00% | 25.00%
Stock Options [Member] | Tranche Three [Member] |  |  |
Assumptions for Stock Awards Granted [Abstract] |  |  |
Annual vesting percentage |  | 34.00% | 25.00%
Stock Options [Member] | Tranche Four [Member] |  |  |
Assumptions for Stock Awards Granted [Abstract] |  |  |
Annual vesting percentage |  |  | 25.00%

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Name: | us-gaap_VestingAxis=mod_ShareBasedCompensationAwardTrancheFourMember
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Data Type: | na
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