Property and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Jun. 30, 2017
Property, Plant and Equipment [Line Items]
Cost	$ 493,551	$ 458,461
Accumulated Depreciation	(248,173)	(231,043)
Net	245,378	227,418
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Cost	24,414	23,026
Accumulated Depreciation	(15,286)	(14,879)
Net	9,128	8,147
Office equipment
Property, Plant and Equipment [Line Items]
Cost	1,468	1,245
Accumulated Depreciation	(621)	(597)
Net	847	648
Computer hardware
Property, Plant and Equipment [Line Items]
Cost	177,520	164,268
Accumulated Depreciation	(112,368)	(104,572)
Net	65,152	59,696
Computer software
Property, Plant and Equipment [Line Items]
Cost	74,796	72,835
Accumulated Depreciation	(37,057)	(33,862)
Net	37,739	38,973
Capitalized software development costs
Property, Plant and Equipment [Line Items]
Cost	70,175	67,092
Accumulated Depreciation	(31,650)	(28,430)
Net	38,525	38,662
Leasehold improvements
Property, Plant and Equipment [Line Items]
Cost	96,474	81,564
Accumulated Depreciation	(40,806)	(38,642)
Net	55,668	42,922
Land and buildings
Property, Plant and Equipment [Line Items]
Cost	48,704	48,431
Accumulated Depreciation	(10,385)	(10,061)
Net	$ 38,319	$ 38,370