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Available-for-sale investments - Additional Information (Detail) (USD $) | 12 Months Ended
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Jun. 30, 2011 | Jun. 30, 2010 | Jun. 30, 2009
Schedule of Available-for-sale Securities [Line Items] |  |  |
Gross unrealized gains on available-for-sale investments | $ 1,100,000 | $ 1,200,000 |
Gross unrealized losses on available-for-sale investments | 58,000 | 28,000 |
Proceeds from maturities or sales of available-for-sale securities | $ 173,500,000 | $ 66,600,000 | $ 75,700,000

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