SEGMENT AND GEOGRAPHICAL INFORMATION (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011
Revenues, operating income and identifiable assets by geographic region
Revenues	$ 264,402	$ 259,147	$ 238,339	$ 235,151	$ 245,795	$ 228,540	$ 210,457	$ 194,967	$ 997,039	$ 879,759	$ 758,155
Operating income									235,510	179,443	151,535
Identifiable assets	979,265				970,467				979,265	970,467	927,394
United States and Canada
Revenues, operating income and identifiable assets by geographic region
Revenues									826,975	716,075	619,219
Operating income									214,527	159,324	135,096
Identifiable assets	742,900				730,758				742,900	730,758	692,778
International
Revenues, operating income and identifiable assets by geographic region
Revenues									170,064	163,684	138,936
Operating income									20,983	20,119	16,439
Identifiable assets	$ 236,365				$ 239,709				$ 236,365	$ 239,709	$ 234,616