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Marketable Securities (Details) (USD $) In Thousands, unless otherwise specified |  |  |  |  | 12 Months Ended |  |  |  |  |  |  |  |  |  |
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Sep. 30, 2012 Securities | Sep. 30, 2011 | Sep. 30, 2012 Current Assets [Member] | Sep. 30, 2011 Current Assets [Member] | Sep. 30, 2012 Non-current Assets [Member] | Sep. 30, 2012 Corporate Bonds [Member] Current Assets [Member] | Sep. 30, 2011 Corporate Bonds [Member] Current Assets [Member] | Sep. 30, 2012 Corporate Bonds [Member] Non-current Assets [Member] | Sep. 30, 2011 Corporate Bonds [Member] Non-current Assets [Member] | Sep. 30, 2012 Commercial Paper [Member] Current Assets [Member] | Sep. 30, 2011 Commercial Paper [Member] Current Assets [Member] | Sep. 30, 2012 Certificates of Deposit [Member] Current Assets [Member] | Sep. 30, 2011 Certificates of Deposit [Member] Current Assets [Member] | Sep. 30, 2012 Government Municipal Bonds [Member] Current Assets [Member] | Sep. 30, 2011 Government Municipal Bonds [Member] Current Assets [Member]
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of securities below amortized cost basis | 42 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of securities | 62 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity period |  |  |  |  |  |  |  |  | 15 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortized cost | $ 60,401 | [1] | $ 53,280 | [2] | $ 58,382 | [1] | $ 51,667 | [2] |  | $ 39,306 | [1] | $ 22,694 | [2] | $ 2,019 | [1] | $ 1,613 | [2] | $ 2,000 | [1] | $ 4,998 | [2] | $ 7,262 | [1] | $ 8,775 | [2] | $ 9,814 | [1] | $ 15,200 | [2]
Unrealized gains | 15 |  | 21 |  | 15 |  | 21 |  |  | 14 |  | 18 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 1 |  | 3 |
Unrealized losses | (28) | [3] | (174) | [4] | (25) | [3] | (164) | [4] |  | (19) | [3] | (144) | [4] | (3) | [3] | (10) | [4] | 0 | [3] | (3) | [4] | (4) | [3] | (9) | [4] | (2) | [3] | (8) | [4]
Fair Value | 60,388 | [1] | 53,127 | [2] | 58,372 | [1] | 51,524 | [2] |  | 39,301 | [1] | 22,568 | [2] | 2,016 | [1] | 1,603 | [2] | 2,000 | [1] | 4,995 | [2] | 7,258 | [1] | 8,766 | [2] | 9,813 | [1] | 15,195 | [2]
Purchased and accrued interest | 485 |  | 478 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate related fair value of securities with unrealized losses | $ 34,503 |  | $ 43,755 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Included in amortized cost and fair value is purchased and accrued interest of $485.
[2] | Included in amortized cost and fair value is purchased and accrued interest of $478
[3] | The aggregate fair value of securities with unrealized losses as of September 30, 2012 was $34,503. These investments have been in an unrealized loss position for less than twelve months.
[4] | The aggregate fair value of securities with unrealized losses as of September 30, 2011 was $43,755. These investments have been in an unrealized loss position for less than twelve months.

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