Segment Information (Summary Of Revenue By Segment And Reconciling Items) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Revenues	$ 651,100	$ 601,273	$ 1,239,380	$ 1,124,932
Operating Income (Loss)	157,078	146,016	301,211	258,574
Amortization of acquired intangible assets	15,840	11,317	28,707	23,099
Acquisition related expenses	6,123		6,123
Interest income	(678)	(4,579)	(1,600)	(9,449)
Interest expense	7,487	7,370	11,195	15,155
Loss attributable to equity method investments	(3,375)		(3,375)
Other, net	(621)	(1,460)	(3,086)	(2,618)
Income before income taxes	146,273	141,765	285,155	250,250
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)	213,600	184,100	404,600	333,100
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Deferred revenue fair value adjustment	(2,000)		(2,000)
Unallocated corporate costs	32,600	26,700	66,500	51,400
Amortization of acquired intangible assets	15,800	11,300	28,700	23,100
Acquisition related expenses	6,100		6,100
Deferred revenue fair value adjustment	2,000		2,000
Interest income	(700)	(4,600)	(1,600)	(9,500)
Interest expense	7,500	7,400	11,200	15,200
Loss attributable to equity method investments	3,400		3,400
Other, net	600	1,500	3,100	2,600
Income before income taxes	146,300	141,800	285,200	250,300
Devices [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	342,700	337,000	666,800	623,200
Masks And Other [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	245,200	225,600	461,900	424,900
Total Sleep And Respiratory Care [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	587,900	562,600	1,128,700	1,048,100
Operating Income (Loss)	196,500	171,300	372,200	306,900
Software As A Service Before Deferred Revenue Adjustment [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	65,200	38,700	112,700	76,800
Software As A Service [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Deferred revenue fair value adjustment	(2,000)		(2,000)
Revenues	63,200	38,700	110,700	76,800
Operating Income (Loss)	17,100	$ 12,800	32,400	$ 26,200
Deferred revenue fair value adjustment	$ 2,000		$ 2,000