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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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