Segment Information (Details) (USD $)	12 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2009
Revenue from external customers	$ 1,243,148,000	$ 1,092,357,000	$ 920,735,000
Long lived assets	462,107,000	387,148,000	377,613,000
Flow Generators [Member]
Segment sales	699,300,000	633,600,000	532,100,000
Mask Systems, Motors And Other Accessories [Member]
Segment sales	543,900,000	458,800,000	388,600,000
U.S.A [Member]
Revenue from external customers	662,240,000	590,402,000	493,402,000
Long lived assets	148,840,000	142,039,000	142,074,000
Germany [Member]
Revenue from external customers	171,394,000	155,957,000	132,220,000
Long lived assets	26,320,000	17,938,000	20,434,000
Australia [Member]
Revenue from external customers	34,975,000	26,099,000	21,037,000
Long lived assets	268,695,000	215,026,000	204,529,000
France [Member]
Revenue from external customers	137,330,000	118,511,000	106,343,000
Long lived assets	6,276,000	4,646,000	4,370,000
Rest Of World [Member]
Revenue from external customers	237,209,000	201,388,000	167,733,000
Long lived assets	$ 11,976,000	$ 7,499,000	$ 6,206,000