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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