SEGMENT INFORMATION - Revenue From External Customers Attributed To Foreign Countries By Geographic Area (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	$ 3,109,736	$ 2,868,755	$ 2,815,241
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	149,457	153,890	149,812
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	1,719,877	1,490,863	1,425,244
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	186,756	182,815	201,821
Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	195,286	203,403	198,253
Rest of EMEA
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	560,239	534,204	517,693
All other countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	$ 298,121	$ 303,580	$ 322,418