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Investments - Additional Information (Detail) (USD $)
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3 Months Ended |
9 Months Ended |
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Apr. 06, 2013
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Apr. 06, 2013
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Jun. 30, 2012
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Mar. 31, 2012
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| Schedule of Available-for-sale Securities [Line Items] |
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| Short term available for Sale securities |
$ 41,084,000 |
$ 41,084,000 |
$ 76,428,000 |
$ 79,926,000 |
| Available for sale securities |
58,621,000 |
58,621,000 |
60,002,000 |
64,410,000 |
| Temporary impairment charge |
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6,900,000 |
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| Percentage of Company's ARS portfolio |
92.00% |
92.00% |
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| Investment maturity date range year start |
2018 |
2018 |
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| Investments maturity date range year end |
2042 |
2042 |
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| Par value of action rate securities |
0 |
22,400,000 |
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Long term auction rate securities gross [Member]
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| Schedule of Available-for-sale Securities [Line Items] |
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| Available for sale securities |
45,600,000 |
45,600,000 |
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Municipal Bonds [Member]
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| Schedule of Available-for-sale Securities [Line Items] |
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| Percentage of Company's ARS portfolio |
8.00% |
8.00% |
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Standard & Poor's, AAA Rating [Member]
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| Schedule of Available-for-sale Securities [Line Items] |
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| Company's ARS Percentage consist |
20.00% |
20.00% |
27.00% |
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Standard & Poor's, AA Rating [Member]
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| Schedule of Available-for-sale Securities [Line Items] |
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| Company's ARS Percentage consist |
47.00% |
47.00% |
23.00% |
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Standard & Poor's, A Rating [Member]
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| Schedule of Available-for-sale Securities [Line Items] |
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| Company's ARS Percentage consist |
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28.00% |
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Standard & Poor's, BBB Rating [Member]
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| Schedule of Available-for-sale Securities [Line Items] |
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| Company's ARS Percentage consist |
18.00% |
18.00% |
12.00% |
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Standard & Poor's, CCC Rating [Member]
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| Schedule of Available-for-sale Securities [Line Items] |
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| Company's ARS Percentage consist |
15.00% |
15.00% |
10.00% |
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Treasury bills [Member]
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| Schedule of Available-for-sale Securities [Line Items] |
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| Short term available for Sale securities |
12,000,000 |
12,000,000 |
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| Available for sale securities |
19,900,000 |
19,900,000 |
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Certificates of deposit [Member]
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| Schedule of Available-for-sale Securities [Line Items] |
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| Short term available for Sale securities |
29,100,000 |
29,100,000 |
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Long term auction rate securities [Member]
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| Schedule of Available-for-sale Securities [Line Items] |
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| Available for sale securities |
$ 38,700,000 |
$ 38,700,000 |
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