Goodwill and Other Intangible Assets (Changes in Carrying Amount of Goodwill) (Details) - USD ($)	3 Months Ended		12 Months Ended
	Jun. 30, 2018	Sep. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Goodwill
Goodwill		$ 1,018,892,000	$ 1,018,892,000	$ 1,019,247,000
Acquisition activity			7,062,000	10,045,000
Reallocation of goodwill between reporting units			0	0
Translation and other adjustments, net			5,882,000	(10,400,000)
Impairment charge	$ (7,700,000)		(7,700,000)	0	$ (84,548,000)
Goodwill	1,024,136,000		1,024,136,000	1,018,892,000	1,019,247,000
Accumulated impairment charge	134,277,000		134,277,000	126,577,000	126,577,000
United States
Goodwill
Goodwill		588,333,000	588,333,000	605,702,000
Acquisition activity			0	0
Reallocation of goodwill between reporting units			(35,519,000)	(16,377,000)
Translation and other adjustments, net			0	(992,000)
Impairment charge			0
Goodwill	552,814,000		552,814,000	588,333,000	605,702,000
United Kingdom
Goodwill
Goodwill		329,135,000	329,135,000	332,561,000
Acquisition activity			7,062,000	6,962,000
Reallocation of goodwill between reporting units			35,519,000	0
Translation and other adjustments, net			5,447,000	(10,388,000)
Impairment charge		0	0
Goodwill	377,163,000		377,163,000	329,135,000	332,561,000
Accumulated impairment charge	97,358,000		97,358,000	97,358,000	97,358,000
Rest of World
Goodwill
Goodwill		$ 101,424,000	101,424,000	80,984,000
Acquisition activity			0	3,083,000
Reallocation of goodwill between reporting units			0	16,377,000
Translation and other adjustments, net			435,000	980,000
Impairment charge			(7,700,000)
Goodwill	94,159,000		94,159,000	101,424,000	80,984,000
Europe
Goodwill
Accumulated impairment charge	29,219,000		29,219,000	$ 29,219,000	$ 29,219,000
Cultivate | Operating Segments
Goodwill
Accumulated impairment charge	$ 7,700,000		$ 7,700,000