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Available-for-sale investments - Additional Information (Detail) (USD $)
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12 Months Ended | ||
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Jun. 30, 2011
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Jun. 30, 2010
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Jun. 30, 2009
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| 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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- Definition
This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
This item represents the gross unrealized losses for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.
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- Definition
The cash inflow associated with the sale or maturity (principal being due) of securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
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