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Equity Incentive Plan - Other (Details) $ / shares in Units, $ in Millions				3 Months Ended		12 Months Ended				34 Months Ended
	Aug. 01, 2018 shares	Aug. 02, 2017 shares	Aug. 01, 2017	Mar. 31, 2019 USD ($) $ / shares shares	Sep. 30, 2018 USD ($) $ / shares shares	Jun. 30, 2019 USD ($) $ / shares shares	Jun. 30, 2018 USD ($) item $ / shares shares	Jun. 30, 2017 USD ($) $ / shares shares	Jun. 30, 2016 USD ($) $ / shares shares	Jun. 30, 2018 USD ($) $ / shares shares	Jun. 30, 2019 USD ($) shares
Equity Incentive Market Based Restricted Stock Awards
Equity Transactions
Performance shares						6,800					6,800
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)						6,800
Restricted Stock
Equity Transactions
Stock based compensation expense \| $						$ 12.3	$ 15.7		$ 16.8
Fair value of share-based compensation awards granted in period \| $						15.3	20.2
Fair value of share-based compensation awards vested in period \| $						$ 20.6	$ 22.1
Performance shares					1,676,907	1,676,907	2,141,047	2,131,790	2,131,790	1,676,907	1,322,552
Unrecognized compensation \| $											$ 14.4
Weighted average period for recognition of total unrecognized compensation expense related to unvested stock options granted						1 year 6 months
Nonvested at the beginning of the period (in shares)					1,676,907	1,676,907	2,141,047	2,131,790
Granted (in shares)						828,833	1,210,502	1,268,311
Vested (in shares)						(947,703)	(1,339,492)	(1,084,046)
Forfeited or canceled (in shares)						(235,485)	(335,150)	(175,008)
Nonvested at the end of the period (in shares)						1,322,552	1,676,907	2,141,047	2,131,790	1,676,907
Nonvested at the beginning of the period (in dollars per share) \| $ / shares					$ 15.12	$ 15.12	$ 12.34	$ 12.46
Granted (in dollars per share) \| $ / shares						18.44	16.68	12.70
Vested (in dollars per share) \| $ / shares						14.72	12.29	12.94
Forfeited or canceled (in dollars per share) \| $ / shares						17.40	14.31	12.69
Nonvested at the end of the period (in dollars per share) \| $ / shares						$ 17.08	$ 15.12	$ 12.34	$ 12.46	$ 15.12
Restricted Stock \| Vesting Performance
Equity Transactions
Performance shares						271,455					271,455
Granted (in shares)						37,378
Nonvested at the end of the period (in shares)						271,455
Percentage of target that the stock awards were granted at	100.00%
Number of shares earned upon reaching performance threshold	46,845
Restricted Stock \| Service based awards
Equity Transactions
Performance shares						1,044,297					1,044,297
Granted (in shares)						791,455
Vested (in shares)						(616,920)
Nonvested at the end of the period (in shares)						1,044,297
Performance Share Units
Equity Transactions
Stock based compensation expense \| $						$ 3.9	$ 5.9	$ 3.8
Performance shares					708,979	708,979	1,043,602	1,089,602	1,089,602	708,979	2,372,241
Unrecognized compensation \| $											$ 13.4
Weighted average period for recognition of total unrecognized compensation expense related to unvested stock options granted						2 years 2 months 12 days
Nonvested at the beginning of the period (in shares)					708,979	708,979	1,043,602	1,089,602
Granted (in shares)						2,372,241	138,241	52,000
Vested (in shares)						(427,954)	(320,340)
Forfeited or canceled (in shares)						(281,025)	(152,524)	(98,000)
Nonvested at the end of the period (in shares)						2,372,241	708,979	1,043,602	1,089,602	708,979
Nonvested at the beginning of the period (in dollars per share) \| $ / shares					$ 13.15	$ 13.15	$ 13.16	$ 12.91
Granted (in dollars per share) \| $ / shares						10.61	12.81	18.97
Vested (in dollars per share) \| $ / shares						13.24	12.62
Forfeited or canceled (in dollars per share) \| $ / shares						13.02	14.00	13.45
Nonvested at the end of the period (in dollars per share) \| $ / shares						$ 10.61	$ 13.15	$ 13.16	$ 12.91	$ 13.15
Performance Share Units \| 2019 SPP
Equity Transactions
Granted (in shares)					1,766,932
Performance Share Units \| Fiscal Year 2019 LTIP
Equity Transactions
Stock based compensation expense \| $						$ 0.0
Fair value \| $				$ 7.9
Granted (in shares)				263,936
Granted (in dollars per share) \| $ / shares				$ 30.05
Performance Share Units \| Modification
Equity Transactions
Fair value \| $					$ 0.4
Granted (in shares)					23,670
Granted (in dollars per share) \| $ / shares					$ 17.45
Performance Share Units \| Vesting Performance
Equity Transactions
Fair value \| $					$ 6.3
Granted (in shares)					317,703
Granted (in dollars per share) \| $ / shares					$ 19.76
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 \| Fiscal Year 2019 LTIP
Equity Transactions
Earned award vesting percentage					45.00%
Performance Shares Tranche #1 \| Quarterly Period Beginning November 15, 2017
Equity Transactions
Earned award vesting percentage									30.00%
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
Number of performance conditions achievement deemed probable \| item							1
Number of performance measures \| item							2
Stock based compensation expense \| $										$ 3.9
Percentage below target for academic measure	1
Performance Shares Tranche #2 \| Fiscal Year 2019 LTIP
Equity Transactions
Earned award vesting percentage					25.00%
Performance Shares Tranche #2 \| Period After August 15, 2018
Equity Transactions
Earned award vesting percentage									70.00%
Performance Shares Tranche #2 - Academic Measure
Equity Transactions
Granted (in shares)	349,996
Reduction in shares due to below target performance (in shares)	15,345
Performance Shares Tranche #3 \| Fiscal Year 2019 LTIP
Equity Transactions
Earned award vesting percentage					30.00%
Deferred Stock Units
Equity Transactions
Granted (in shares)						18,258
Granted (in dollars per share) \| $ / shares						$ 25.41
Nonvested at the end of the period (in dollars per share) \| $ / shares						$ 18,258.00
Senior Executives \| Performance Share Units \| 2019 SPP
Equity Transactions
Market capitalization growth performance period						3 years
Fair value \| $					$ 10.5
Threshold period average price of stock to determine final amount					30 days
Threshold days after release of fiscal year 2021 results to calculate average price of stock					7 days
Granted (in dollars per share) \| $ / shares					$ 5.97
Senior Executives \| Performance Share Units \| Total stock price growth less than 25% \| 2019 SPP
Equity Transactions
Percentage of total stock price growth						25.00%
Annualized percentage of total stock price growth						7.60%
Senior Executives \| Performance Share Units \| Total stock price growth 33%
Equity Transactions
Amount earned as percentage of total value growth						6.00%
Percentage of total stock price growth						33.00%
Senior Executives \| Performance Share Units \| Total stock price growth 33% \| 2019 SPP
Equity Transactions
Annualized percentage of total stock price growth						10.00%
Senior Executives \| Performance Share Units \| Total stock price growth equals or greater than 95% \| 2019 SPP
Equity Transactions
Amount earned as percentage of total value growth						7.50%
Percentage of total stock price growth						95.00%
Annualized percentage of total stock price growth						25.00%
Mr. Davis \| Performance Shares Tranche #1
Equity Transactions
Granted (in shares)		90,000
Mr. Davis \| Performance Shares Tranche #2 - Academic Measure
Equity Transactions
Percentage below target for academic measure	76,640
Mr. Udell \| Performance Shares Tranche #1
Equity Transactions
Granted (in shares)		70,021
Mr. Udell \| Performance Shares Tranche #2 - Academic Measure
Equity Transactions
Granted (in shares)	59,626