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Equity Incentive Plan - Other (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 02, 2017 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2017 | Sep. 30, 2017
Equity Transactions |  |  |  |  |  |  |  |
Fair value of share-based compensation awards granted in period |  | $ 16.7 |  | $ 13.3 |  |  |  |
Fair value of share-based compensation awards vested in period |  |  |  |  | $ 12.9 | $ 6.0 |  |
Vested (in shares) |  |  |  |  | 91,732 |  |  |
Vesting Performance |  |  |  |  |  |  |  |
Equity Transactions |  |  |  |  |  |  |  |
Number of consecutive days considered for the computation of average closing stock prices |  |  |  |  |  |  | 30 days |
Equity Incentive Market Based Restricted Stock Awards |  |  |  |  |  |  |  |
Equity Transactions |  |  |  |  |  |  |  |
Granted (in dollars per share) |  |  |  |  |  |  | $ 14.35 |
Equity Incentive Market Based Restricted Stock Awards | Vesting Performance |  |  |  |  |  |  |  |
Equity Transactions |  |  |  |  |  |  |  |
Nonvested at the end of the period (in shares) |  | 205,343 |  |  | 205,343 |  |  |
Equity Incentive Market Based Restricted Stock Awards | Service based awards |  |  |  |  |  |  |  |
Equity Transactions |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 557,870 |  |  |
Vested (in shares) |  |  |  |  | 424,153 |  |  |
Nonvested at the end of the period (in shares) |  | 1,387,834 |  |  | 1,387,834 |  |  |
Equity Incentive Market Based Restricted Stock Awards | Stock price performance target one |  |  |  |  |  |  |  |
Equity Transactions |  |  |  |  |  |  |  |
Stock price |  |  | $ 13 |  |  |  | 13 |
Vested (in shares) |  |  |  |  | 10,000 |  |  |
Equity Incentive Market Based Restricted Stock Awards | Stock price performance target two |  |  |  |  |  |  |  |
Equity Transactions |  |  |  |  |  |  |  |
Stock price |  |  | 16 |  |  |  | 16 |
Equity Incentive Market Based Restricted Stock Awards | Stock price performance target three |  |  |  |  |  |  |  |
Equity Transactions |  |  |  |  |  |  |  |
Stock price |  |  | $ 19 |  |  |  | $ 19 |
Restricted Stock |  |  |  |  |  |  |  |
Equity Transactions |  |  |  |  |  |  |  |
Stock based compensation expense |  | $ 3.9 |  | 4.2 | $ 7.8 | 8.2 |  |
Unrecognized compensation |  | $ 22.0 |  |  | $ 22.0 |  |  |
Weighted average period for recognition of total unrecognized compensation expense related to unvested stock options granted |  |  |  |  | 1 year 7 months 6 days |  |  |
Nonvested at the beginning of the period (in shares) |  |  |  |  | 2,141,047 |  |  |
Granted (in shares) |  |  |  |  | 956,312 |  |  |
Vested (in shares) |  |  |  |  | 735,825 |  |  |
Nonvested at the end of the period (in shares) |  | 2,203,810 | 2,141,047 |  | 2,203,810 |  | 2,141,047 |
Granted (in dollars per share) |  |  |  |  | $ 17.49 |  |  |
Performance Share Units |  |  |  |  |  |  |  |
Equity Transactions |  |  |  |  |  |  |  |
Stock based compensation expense |  | $ 3.0 | $ 3.8 | $ 0.0 | $ 3.5 | $ 0.0 |  |
Percentage of target award probable at the highest level |  |  |  |  |  |  | 150.00% |
Board of Directors certified that MPS schools were not in academic jeopardy | 97.00% |  |  |  |  |  |  |
Unrecognized compensation |  | $ 1.4 |  |  | $ 1.4 |  |  |
Nonvested at the beginning of the period (in shares) |  |  |  |  | 1,043,602 |  |  |
Granted (in shares) |  |  |  |  | 138,241 |  |  |
Vested (in shares) |  |  |  |  | 103,687 |  |  |
Nonvested at the end of the period (in shares) |  | 1,008,156 | 1,043,602 |  | 1,008,156 |  | 1,043,602 |
Granted (in dollars per share) |  |  |  |  | $ 18.07 |  |  |
Performance Share Units | Actual performance exceeds the target criteria |  |  |  |  |  |  |  |
Equity Transactions |  |  |  |  |  |  |  |
Stock based compensation expense |  |  |  |  | $ 5.6 |  |  |
Performance Shares Tranche #1 |  |  |  |  |  |  |  |
Equity Transactions |  |  |  |  |  |  |  |
Granted (in shares) | 446,221 |  |  |  |  |  |  |
Granted due to the Outperform level (in shares) | 138,241 |  |  |  |  |  |  |
Performance Shares Tranche #2 |  |  |  |  |  |  |  |
Equity Transactions |  |  |  |  |  |  |  |
Stock based compensation expense |  | $ 2.5 |  |  | $ 0.0 |  |  |
Unrecognized compensation |  |  |  |  |  |  |  | $ 3.5
Mr. Davis | Performance Shares Tranche #1 |  |  |  |  |  |  |  |
Equity Transactions |  |  |  |  |  |  |  |
Granted (in shares) | 90,000 |  |  |  |  |  |  |
Mr. Udell | Performance Shares Tranche #1 |  |  |  |  |  |  |  |
Equity Transactions |  |  |  |  |  |  |  |
Granted (in shares) | 70,021 |  |  |  |  |  |  |

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