Shares Repurchased under Programs (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010
Equity, Class of Treasury Stock [Line Items]
Total Cost	$ 158,093	$ 132,940	$ 41,683
Authorized on November 15, 2006
Equity, Class of Treasury Stock [Line Items]
Shares Repurchased	908,399
Total Cost	35,000
Authorized on May 13, 2008
Equity, Class of Treasury Stock [Line Items]
Shares Repurchased	1,027,417
Total Cost	50,000
Authorized on November 11, 2009
Equity, Class of Treasury Stock [Line Items]
Shares Repurchased	972,205
Total Cost	50,000
Authorized on August 11, 2010
Equity, Class of Treasury Stock [Line Items]
Shares Repurchased	1,103,628
Total Cost	50,000
Authorized on November 10, 2010
Equity, Class of Treasury Stock [Line Items]
Shares Repurchased	968,105
Total Cost	50,000
Authorized on May 20, 2011
Equity, Class of Treasury Stock [Line Items]
Shares Repurchased	2,396,143
Total Cost	100,000
Authorized on November 2, 2011
Equity, Class of Treasury Stock [Line Items]
Shares Repurchased	2,005,373
Total Cost	66,400
Repurchase of Equity
Equity, Class of Treasury Stock [Line Items]
Shares Repurchased	9,381,270
Total Cost	$ 401,400