SEGMENT AND GEOGRAPHICAL INFORMATION (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010
Revenues, operating income and identifiable assets by geographic region
Revenues	$ 245,795	$ 228,540	$ 210,457	$ 194,967	$ 213,680	$ 190,941	$ 182,726	$ 170,808	$ 879,759	$ 758,155	$ 778,191
Operating income									179,443	151,535	184,110
Identifiable assets	970,467				927,394				970,467	927,394	913,176
United States and Canada
Revenues, operating income and identifiable assets by geographic region
Revenues									716,075	619,219	621,205
Operating income									159,324	135,096	144,060
Identifiable assets	730,758				692,778				730,758	692,778	743,426
International
Revenues, operating income and identifiable assets by geographic region
Revenues									163,684	138,936	156,986
Operating income									20,119	16,439	40,050
Identifiable assets	$ 239,709				$ 234,616				$ 239,709	$ 234,616	$ 169,750