Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Jun. 30, 2017
Property, Plant and Equipment [Line Items]
Cost	$ 528,369	$ 458,461
Accumulated Depreciation	(267,473)	(231,043)
Net	260,896	227,418
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Cost	30,734	23,026
Accumulated Depreciation	(16,494)	(14,879)
Net	14,240	8,147
Office equipment
Property, Plant and Equipment [Line Items]
Cost	1,412	1,245
Accumulated Depreciation	(685)	(597)
Net	727	648
Computer hardware
Property, Plant and Equipment [Line Items]
Cost	189,567	164,268
Accumulated Depreciation	(119,097)	(104,572)
Net	70,470	59,696
Computer software
Property, Plant and Equipment [Line Items]
Cost	77,223	72,835
Accumulated Depreciation	(41,024)	(33,862)
Net	36,199	38,973
Capitalized software development costs
Property, Plant and Equipment [Line Items]
Cost	73,903	67,092
Accumulated Depreciation	(34,906)	(28,430)
Net	38,997	38,662
Leasehold improvements
Property, Plant and Equipment [Line Items]
Cost	107,024	81,564
Accumulated Depreciation	(44,502)	(38,642)
Net	62,522	42,922
Land and buildings
Property, Plant and Equipment [Line Items]
Cost	48,506	48,431
Accumulated Depreciation	(10,765)	(10,061)
Net	$ 37,741	$ 38,370