Annual report pursuant to Section 13 and 15(d)

Supplemental disclosures of cash flow information and non cash investing and financing activities - Additional Information (Detail)

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Supplemental disclosures of cash flow information and non cash investing and financing activities - Additional Information (Detail) (USD $)
12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2010
Other Significant Noncash Transactions [Line Items]      
Cash paid for income taxes $ 58,700,000 $ 46,200,000 $ 49,700,000
Stock options shares of common stock exercised   14,834  
Shares of common stock surrender as a result of option exercise   9,096  
Fair market value of common stock surrender as a result of option exercise   $ 561,000