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Share-Based Compensation - Narrative (Details) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Jun. 30, 2018 USD ($) plan $ / shares shares | Jun. 30, 2017 USD ($) $ / shares shares | Jun. 30, 2016 USD ($) $ / shares shares | Jun. 30, 2015 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of share-based compensation plans (plan) | plan | 2 |  |  |
Compensation cost | $ 17.6 | $ 13.0 | $ 8.7 |
Stock options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation cost | $ 5.0 | $ 4.7 | $ 3.1 |
Weighted average grant date fair value (in dollars per share) | $ / shares | $ 11.65 | $ 10.81 | $ 9.27 |
Unvested stock option cost | $ 4.1 |  |  |
Stock option weighted average remaining life | 1 year 2 months 12 days |  |  |
Options outstanding (in shares) | shares | 2,223,261 | 2,392,428 | 1,701,502 | 1,507,878
Stock options | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares vesting period | 1 year |  |  |
Stock options | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares vesting period | 3 years |  |  |
Expiration term | 10 years |  |  |
Total Stockholder Return Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation cost | $ 2.8 | $ 2.0 | $ 2.0 |
Shares vesting period | 3 years |  |  |
Total Stockholder Return Awards | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Target shares awarded percentage | 0.00% |  |  |
Total Stockholder Return Awards | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Target shares awarded percentage | 200.00% |  |  |
Omnibus Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares available for grant (in shares) | shares | 2,567,536 |  |  |
Omnibus Plan | Stock options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options outstanding (in shares) | shares | 2,031,795 |  |  |
Omnibus Plan | Performance-based restricted stock unit awards | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares vesting period | 0 years |  |  |
Omnibus Plan | Performance-based restricted stock unit awards | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares vesting period | 2 years |  |  |
Omnibus Plan | Time-based restricted stock unit awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares vesting period | 3 years |  |  |
Omnibus Plan | Restricted stock unit awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation cost | $ 8.8 | 5.0 | 2.4 |
Unvested stock option cost | $ 11.0 |  |  |
Stock option weighted average remaining life | 1 year 3 months 18 days |  |  |
Director's Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation cost | $ 1.0 | $ 1.2 | $ 1.2 |
Shares available for grant (in shares) | shares | 572,104 |  |  |
Shares vesting period | 1 year |  |  |
Unvested stock option cost | $ 0.3 |  |  |
Stock option weighted average remaining life | 3 months 18 days |  |  |
Percentage of Director's annual retainer paid in stock instead of cash | 50.00% |  |  |
Percentage of Director's committee chair fees paid in stock instead of cash | 100.00% |  |  |
Director's Plan | Every Three Months |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Percentage of shares vesting following grant date | 25.00% |  |  |
Director's Plan | 1/4 of the units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock vesting period with reference to service term | 3 months |  |  |
Director's Plan | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Percentage of Director's annual retainer paid in stock instead of cash | 50.00% |  |  |
Director's Plan | Stock options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options outstanding (in shares) | shares | 191,466 |  |  |

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