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Stock-based Compensation - Narrative (Details) - USD ($) $ in Millions |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 08, 2016 | Aug. 31, 2017 | Mar. 31, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Jan. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares reserved for outstanding awards (in shares) |  |  | 7,512,769 |  | 8,301,138 |
Stock options |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized compensation cost related to non-vested stock-based awards |  |  | $ 6.6 |  |  |
Unrecognized compensation cost related to non-vested stock based awards, period for recognition |  |  | 2 years 6 months 14 days |  |  |
RSU |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized compensation cost related to non-vested stock-based awards |  |  | $ 28.3 |  |  |
Unrecognized compensation cost related to non-vested stock based awards, period for recognition |  |  | 2 years 7 months 27 days |  |  |
PRSU |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock option expected life |  | 1 year |  |  |  |
Number of awards |  | 2 |  |  |  |
Unrecognized compensation cost related to non-vested stock-based awards |  |  | $ 0.4 |  |  |
Unrecognized compensation cost related to non-vested stock based awards, period for recognition |  |  | 1 year 9 months |  |  |
Performance-Based Restricted Stock Units (PRSUs) Two-Year |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Ownership percentage threshold for employee owned incentive stock options to qualify for exercise price per share |  | 100.00% |  |  |  |
Stock option expected life |  | 2 years |  |  |  |
Performance-Based Restricted Stock Units (PRSUs) Two-Year | Year one |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock option and restricted stock units vesting rights, percentage |  | 50.00% |  |  |  |
Performance-Based Restricted Stock Units (PRSUs) Two-Year | Quarterly |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock option and restricted stock units vesting rights, percentage |  | 5.00% |  |  |  |
Performance-Based Restricted Stock Units (PRSUs), One-Year |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Ownership percentage threshold for employee owned incentive stock options to qualify for exercise price per share |  | 200.00% |  |  | 200.00% |
Performance-Based Restricted Stock Units (PRSUs), One-Year | Year one |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock option and restricted stock units vesting rights, percentage |  | 50.00% |  |  | 50.00% |
Performance-Based Restricted Stock Units (PRSUs), One-Year | Quarterly |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock option and restricted stock units vesting rights, percentage |  | 5.00% |  |  |  |
Equity Incentive Plan, 2016 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares reserved for future issuance (in shares) |  |  |  |  |  | 4,700,000
Increase in units for meeting metrics, percentage | 10.00% |  |  |  |  |
Authorized shares available for future issuance (in shares) |  |  | 1,193,710 |  |  |
Equity Incentive Plan, 2016 | Stock options |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock option expected life | 10 years |  |  |  |  |
Equity Incentive Plan, 2016 | Employee stock options and restricted stock units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period | 4 years |  |  |  |  |
Equity Incentive Plan, 2016 | Employee stock options and restricted stock units | Year one |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock option and restricted stock units vesting rights, percentage | 25.00% |  | 25.00% |  |  |
Equity Incentive Plan, 2016 | Employee stock options and restricted stock units | Quarterly |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock option and restricted stock units vesting rights, percentage |  |  | 6.25% |  |  |
Equity Incentive Plan, 2006 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares reserved for future issuance (in shares) | 2,800,000 |  |  |  |  |
Shares reserved for outstanding awards (in shares) | 8,696,444 |  |  |  |  |
Equity Incentive Plan, 2016, more than 10% ownership |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Percentage of fair market value | 110.00% |  |  |  |  |
Equity Incentive Plan, 2016, less than 10% ownership |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Percentage of fair market value | 100.00% |  |  |  |  |
Subsequent event | Performance-Based Restricted Stock Units (PRSUs), One-Year | Year one |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock option and restricted stock units vesting rights, percentage |  |  |  | 20.00% |  |

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