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]
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Sep. 30, 2011
Current Assets [Member]
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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]
|
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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 | |||||||||||||||||||||||||||||||||||
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