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Supplemental disclosures of cash flow information and non cash investing and financing activities - Additional Information (Detail) (USD $)
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12 Months Ended | ||
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Jun. 30, 2012
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Jun. 30, 2011
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Jun. 30, 2010
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| 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 | ||