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Auction Rate Securities - Additional Information (Detail) (USD $)
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3 Months Ended | 9 Months Ended |
|---|---|---|
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Mar. 31, 2014
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Mar. 31, 2014
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| Schedule of Available-for-sale Securities [Line Items] | ||
| Auction rate securities with fair value maturing from 2015 to 2017 | $ 13,400,000 | $ 13,400,000 |
| Auction rate securities with fair value maturing from 2043 to 2045 | 3,200,000 | 3,200,000 |
| Auction rate securities with fair value having no stated maturity | 2,000,000 | 2,000,000 |
| ARS investments, investment grade | 5,500,000 | 5,500,000 |
| ARS investments, below investment grade | 18,500,000 | 18,500,000 |
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Minimum [Member]
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| Schedule of Available-for-sale Securities [Line Items] | ||
| Maturity period one | 2015 | |
| Maturity period two | 2043 | |
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Maximum [Member]
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| Schedule of Available-for-sale Securities [Line Items] | ||
| Maturity period one | 2017 | |
| Maturity period two | 2045 | |
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Auction Rate Securities [Member]
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| Schedule of Available-for-sale Securities [Line Items] | ||
| ARS investments redeemed at par | $ 0 | $ 0 |