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Number of Common Shares Repurchased at the Average Purchase Price (Detail) (USD $)
12 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2009
Accelerated Share Repurchases [Line Items]      
Shares repurchased 8,008,926 441,118 7,557,284
Average price per share $ 86.54 $ 56.67 $ 59.25