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Property and Equipment - Additional Information (Detail) - USD ($)
$ in Billions
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Property, Plant and Equipment [Line Items]      
Depreciation expense $ 7.7 $ 6.1 $ 4.9
Building, Building Improvements and Leasehold Improvements      
Property, Plant and Equipment [Line Items]      
Committed for construction of new buildings, building improvements and leasehold improvements $ 1.9