Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (Assets and Liabilities Measured at Fair Value on a Recurring Basis [Member], USD $)
In Thousands, unless otherwise specified |
Sep. 30, 2014
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Sep. 30, 2013
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Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ||
Total assets measured at fair value | $ 59,963 | $ 47,011 |
U.S. government and government agency obligations [Member] | Available-for-sale debt securities [Member]
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Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ||
Total assets measured at fair value | 7,394 | 22,890 |
Mortgage-backed securities [Member] | Available-for-sale debt securities [Member]
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Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ||
Total assets measured at fair value | 5,545 | 8,216 |
Asset-backed securities [Member] | Available-for-sale debt securities [Member]
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Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ||
Total assets measured at fair value | 2,369 | 3,537 |
Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member]
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Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ||
Total assets measured at fair value | 1,550 | |
Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member] | U.S. government and government agency obligations [Member] | Available-for-sale debt securities [Member]
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Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ||
Total assets measured at fair value | ||
Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member] | Mortgage-backed securities [Member] | Available-for-sale debt securities [Member]
|
||
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ||
Total assets measured at fair value | ||
Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member] | Asset-backed securities [Member] | Available-for-sale debt securities [Member]
|
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Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ||
Total assets measured at fair value | ||
Significant Other Observable Inputs (Level 2) [Member]
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Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ||
Total assets measured at fair value | 58,413 | 47,011 |
Significant Other Observable Inputs (Level 2) [Member] | U.S. government and government agency obligations [Member] | Available-for-sale debt securities [Member]
|
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Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ||
Total assets measured at fair value | 7,394 | 22,890 |
Significant Other Observable Inputs (Level 2) [Member] | Mortgage-backed securities [Member] | Available-for-sale debt securities [Member]
|
||
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ||
Total assets measured at fair value | 5,545 | 8,216 |
Significant Other Observable Inputs (Level 2) [Member] | Asset-backed securities [Member] | Available-for-sale debt securities [Member]
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Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ||
Total assets measured at fair value | 2,369 | 3,537 |
Significant Unobservable Inputs (Level 3) [Member]
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Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ||
Total assets measured at fair value | ||
Significant Unobservable Inputs (Level 3) [Member] | U.S. government and government agency obligations [Member] | Available-for-sale debt securities [Member]
|
||
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ||
Total assets measured at fair value | ||
Significant Unobservable Inputs (Level 3) [Member] | Mortgage-backed securities [Member] | Available-for-sale debt securities [Member]
|
||
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ||
Total assets measured at fair value | ||
Significant Unobservable Inputs (Level 3) [Member] | Asset-backed securities [Member] | Available-for-sale debt securities [Member]
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Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ||
Total assets measured at fair value | ||
Cash equivalents [Member]
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Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ||
Total assets measured at fair value | 40,100 | 4,402 |
Cash equivalents [Member] | Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member]
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Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ||
Total assets measured at fair value | ||
Cash equivalents [Member] | Significant Other Observable Inputs (Level 2) [Member]
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Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ||
Total assets measured at fair value | 40,100 | 4,402 |
Cash equivalents [Member] | Significant Unobservable Inputs (Level 3) [Member]
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Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ||
Total assets measured at fair value | ||
Available for sale equity securities [Member]
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Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ||
Total assets measured at fair value | 1,550 | |
Available for sale equity securities [Member] | Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member]
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Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ||
Total assets measured at fair value | 1,550 | |
Municipal bonds [Member] | Available-for-sale debt securities [Member]
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Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ||
Total assets measured at fair value | 1,175 | 3,059 |
Municipal bonds [Member] | Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member] | Available-for-sale debt securities [Member]
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Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ||
Total assets measured at fair value | ||
Municipal bonds [Member] | Significant Other Observable Inputs (Level 2) [Member] | Available-for-sale debt securities [Member]
|
||
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ||
Total assets measured at fair value | 1,175 | 3,059 |
Municipal bonds [Member] | Significant Unobservable Inputs (Level 3) [Member] | Available-for-sale debt securities [Member]
|
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Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ||
Total assets measured at fair value | ||
Corporate bonds [Member] | Available-for-sale debt securities [Member]
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Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ||
Total assets measured at fair value | 1,830 | 4,907 |
Corporate bonds [Member] | Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member] | Available-for-sale debt securities [Member]
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||
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ||
Total assets measured at fair value | ||
Corporate bonds [Member] | Significant Other Observable Inputs (Level 2) [Member] | Available-for-sale debt securities [Member]
|
||
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ||
Total assets measured at fair value | 1,830 | 4,907 |
Corporate bonds [Member] | Significant Unobservable Inputs (Level 3) [Member] | Available-for-sale debt securities [Member]
|
||
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ||
Total assets measured at fair value |