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Equity Incentive Plan - Other (Details) $ / shares in Units, $ in Millions |  |  | 12 Months Ended | 34 Months Ended
--- | --- | --- | --- | ---
Aug. 02, 2017 shares | Aug. 01, 2017 | Jun. 30, 2018 USD ($) item $ / shares shares | Jun. 30, 2017 USD ($) $ / shares shares | Jun. 30, 2016 USD ($) $ / shares shares | Jun. 30, 2018 USD ($) shares
Service based awards |  |  |  |  |  |
Equity Transactions |  |  |  |  |  |
Granted (in shares) |  |  | 653,313 |  |  |
Vested (in shares) |  |  | 788,882 |  |  |
Nonvested at the end of the period (in shares) |  |  | 1,018,819 |  |  | 1,018,819
Equity Incentive Market Based Restricted Stock Awards |  |  |  |  |  |
Equity Transactions |  |  |  |  |  |
Number of consecutive days considered for the computation of average closing stock prices |  |  |  | 30 days |  |
Granted (in shares) |  |  |  | 14.35 |  |
Vested (in shares) |  |  | 18,400 |  |  |
Nonvested at the end of the period (in shares) |  |  | 25,200 |  |  | 25,200
Restricted Stock |  |  |  |  |  |
Equity Transactions |  |  |  |  |  |
Stock based compensation expense | $ |  |  | $ 15.7 | $ 16.8 | $ 14.8 |
Fair value of share-based compensation awards granted in period | $ |  |  | 20.2 | 16.0 |  |
Fair value of share-based compensation awards vested in period | $ |  |  | 22.1 | $ 17.5 |  |
Unrecognized compensation | $ |  |  | $ 15.8 |  |  | $ 15.8
Weighted average period for recognition of total unrecognized compensation expense related to unvested stock options granted |  |  | 1 year 3 months 18 days |  |  |
Nonvested at the beginning of the period (in shares) |  |  | 2,141,047 | 2,131,790 | 1,245,504 |
Granted (in shares) |  |  | 1,210,502 | 1,268,311 | 1,704,843 |
Vested (in shares) |  |  | 1,339,492 | 1,084,046 | 722,577 |
Nonvested at the end of the period (in shares) |  |  | 1,676,907 | 2,141,047 | 2,131,790 | 1,676,907
Granted (in dollars per share) | $ / shares |  |  | $ 16.68 | $ 12.70 | $ 10.13 |
Performance Share Units |  |  |  |  |  |
Equity Transactions |  |  |  |  |  |
Stock based compensation expense | $ |  |  | $ 5.9 | $ 3.8 | $ 0.0 |
Unrecognized compensation | $ |  |  | $ 0.3 |  |  | $ 0.3
Nonvested at the beginning of the period (in shares) |  |  | 1,043,602 | 1,089,602 |  |
Granted (in shares) |  |  | 138,241 | 52,000 | 1,154,602 |
Vested (in shares) |  |  | 320,340 |  |  |
Nonvested at the end of the period (in shares) |  |  | 708,979 | 1,043,602 | 1,089,602 | 708,979
Granted (in dollars per share) | $ / shares |  |  | $ 12.81 | $ 18.97 | $ 12.92 |
Performance Shares Tranche #1 |  |  |  |  |  |
Equity Transactions |  |  |  |  |  |
Percentage of MPS schools that were not in academic jeopardy |  | 97.00% |  |  |  |
Granted (in shares) | 446,221 |  |  |  |  |
Granted due to the Outperform level (in shares) | 138,241 |  |  |  |  |
Performance Shares Tranche #1 | Stock price performance target one |  |  |  |  |  |
Equity Transactions |  |  |  |  |  |
Stock based compensation expense | $ |  |  |  |  |  | $ 3.8
Earned award vesting percentage |  |  | 150.00% |  |  |
Performance Shares Tranche #2 |  |  |  |  |  |
Equity Transactions |  |  |  |  |  |
Stock based compensation expense | $ |  |  | $ 3.9 |  |  |
Number of performance conditions achievement deemed probable | item |  |  | 1 |  |  |
Number of performance measures | item |  |  | 2 |  |  |
Expense recorded for lifetime value measure | $ |  |  | $ 0.0 |  |  |
Expense recorded in next fiscal year for lifetime value measure if actual performance deemed to be met at threshold | $ |  |  | $ 2.4 |  |  |
Chief Executive Officer And Executive Chairman | Equity Incentive Market Based Restricted Stock Awards |  |  |  |  |  |
Equity Transactions |  |  |  |  |  |
Vested (in shares) |  |  | 257,075 |  |  |
Chief Executive Officer And Executive Chairman | Equity Incentive Market Based Restricted Stock Awards | Stock price performance target one |  |  |  |  |  |
Equity Transactions |  |  |  |  |  |
Stock price | $ / shares |  |  |  | 13 |  |
Chief Executive Officer And Executive Chairman | Equity Incentive Market Based Restricted Stock Awards | Stock price performance target two |  |  |  |  |  |
Equity Transactions |  |  |  |  |  |
Stock price | $ / shares |  |  |  | 16 |  |
Chief Executive Officer And Executive Chairman | Equity Incentive Market Based Restricted Stock Awards | Stock price performance target three |  |  |  |  |  |
Equity Transactions |  |  |  |  |  |
Stock price | $ / shares |  |  |  | $ 19 |  |
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 |  |  |  |  |
Vesting Performance | Restricted Stock |  |  |  |  |  |
Equity Transactions |  |  |  |  |  |
Granted (in shares) |  |  | 557,189 |  |  |
Vested (in shares) |  |  | 275,135 |  |  |
Nonvested at the end of the period (in shares) |  |  | 632,888 |  |  | 632,888
Vesting Performance | Executives | Restricted Stock |  |  |  |  |  |
Equity Transactions |  |  |  |  |  |
Granted (in shares) |  |  | 46,845 |  |  |
Granted (in dollars per share) | $ / shares |  |  | $ 17.40 |  |  |

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