Segment Information (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales	$ 2,340,196	$ 2,066,737	$ 1,838,713
Devices [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales	1,303,600	1,161,000	1,064,200
Masks And Other Accessories [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales	$ 879,600	$ 767,700	$ 745,600