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Supplemental disclosures of cash flow information and non cash investing and financing activities - Additional Information (Detail) (USD $) | 12 Months Ended
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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 |

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