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Stock-Based Compensation, Stock Options (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Compensation Expense [Abstract] |  |  |
Stock-based compensation expense | $ 6.3 | $ 6.6 | $ 7.9
Stock Options [Member] |  |  |
Compensation Expense [Abstract] |  |  |
Stock-based compensation expense | 0.9 | 1.3 | 1.2
Fair value of awards vesting | 1.3 | $ 1.2 | $ 1.2
Unrecognized compensation costs | $ 1.8 |  |
Weighted average period recognized | 2 years 9 months 18 days |  |
Assumptions for Stock Awards Granted [Abstract] |  |  |
Fair value of options (in dollars per share) | $ 3.46 | $ 5.56 | $ 7.81
Expected life of awards in years | 6 years 1 month 6 days | 6 years 3 months 18 days | 6 years 3 months 18 days
Risk-free interest rate | 0.40% | 2.20% | 2.80%
Expected volatility of the Company's stock | 54.10% | 39.20% | 39.70%
Expected dividend yield on the Company's stock | 0.00% | 0.00% | 0.00%
Award vesting period | 4 years |  |
Stock Options Activity [Rollforward] |  |  |
Outstanding, beginning (in shares) | 1.4 |  |
Granted (in shares) | 0.4 |  |
Exercised (in shares) | (0.4) |  |
Forfeited or expired (in shares) | (0.3) |  |
Outstanding, ending (in shares) | 1.1 | 1.4 |
Exercisable, ending (in shares) | 0.5 |  |
Weighted Average Exercise Price [Rollforward] |  |  |
Outstanding, beginning (in dollars per share) | $ 12.49 |  |
Granted (in dollars per share) | 6.88 |  |
Exercised (in dollars per share) | 10.56 |  |
Forfeited or expired (in dollars per share) | 10.94 |  |
Outstanding, ending (in dollars per share) | 11.63 | $ 12.49 |
Exercisable, ending (in dollars per share) | $ 13.80 |  |
Summary of Stock Option Activity [Abstract] |  |  |
Options, Outstanding, Weighted average remaining contractual term | 7 years 1 month 6 days |  |
Options, Outstanding, Aggregate intrinsic value | $ 3.9 |  |
Options, Exercisable, Weighted average remaining contractual term | 5 years 1 month 6 days |  |
Options, Exercisable, Aggregate intrinsic value | $ 0.9 |  |
Additional Information Related to Stock Options Exercised [Abstract] |  |  |
Intrinsic value of stock options exercised | 1.4 | $ 0.1 | $ 0.7
Proceeds from stock options exercised | $ 4.1 | $ 0.1 | $ 1.1
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 | 25.00% |  |
Stock Options [Member] | Tranche Two [Member] |  |  |
Assumptions for Stock Awards Granted [Abstract] |  |  |
Annual vesting percentage | 25.00% |  |
Stock Options [Member] | Tranche Three [Member] |  |  |
Assumptions for Stock Awards Granted [Abstract] |  |  |
Annual vesting percentage | 25.00% |  |
Stock Options [Member] | Tranche Four [Member] |  |  |
Assumptions for Stock Awards Granted [Abstract] |  |  |
Annual vesting percentage | 25.00% |  |

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