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Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jul. 01, 2017 | Jun. 30, 2018
Accounting standards update 2016- 09 |  |
Accounting Standards |  |
Adjustment to retained earnings | $ 0.1 |
Accounting standards update 2014-09 |  |
Accounting Standards |  |
School year period that revenues had previously been recognized over |  | 10 months

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