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Marketable Securities (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Dec. 31, 2012
Securities
Sep. 30, 2012
Dec. 31, 2012
Current Assets [Member]
Sep. 30, 2012
Current Assets [Member]
Dec. 31, 2012
Non-current Assets [Member]
Dec. 31, 2012
Corporate Bonds [Member]
Current Assets [Member]
Sep. 30, 2012
Corporate Bonds [Member]
Current Assets [Member]
Dec. 31, 2012
Corporate Bonds [Member]
Non-current Assets [Member]
Sep. 30, 2012
Corporate Bonds [Member]
Non-current Assets [Member]
Dec. 31, 2012
Commercial Paper [Member]
Current Assets [Member]
Sep. 30, 2012
Commercial Paper [Member]
Current Assets [Member]
Dec. 31, 2012
Certificates of Deposit [Member]
Current Assets [Member]
Sep. 30, 2012
Certificates of Deposit [Member]
Current Assets [Member]
Dec. 31, 2012
Government Municipal Bonds [Member]
Current Assets [Member]
Sep. 30, 2012
Government Municipal Bonds [Member]
Current Assets [Member]
Dec. 31, 2012
Government Municipal Bonds [Member]
Non-current Assets [Member]
Schedule of Available-for-sale Securities [Line Items]                                
Number of securities below amortized cost basis 36                              
Number of securities 52                              
Maturity period         15 months                      
Amortized cost $ 52,801 [1] $ 60,401 [2] $ 49,517 [1] $ 58,382 [2] $ 3,284 [1] $ 31,486 $ 39,306 $ 1,940 $ 2,019 $ 1,999 $ 2,000 $ 5,760 $ 7,262 $ 10,272 $ 9,814 $ 1,344
Unrealized gains 6 15 6 15 0 6 14 0 0 0 0 0 0 0 1 0
Unrealized losses (17) [3] (28) [4] (11) [3] (25) [4] (6) [3] (6) (19) (5) (3) (2) 0 (1) (4) (2) (2) (1)
Fair Value 52,790 [1] 60,388 [2] 49,512 [1] 58,372 [2] 3,278 [1] 31,486 [1] 39,301 [2] 1,935 [1] 2,016 [2] 1,997 [1] 2,000 [2] 5,759 [1] 7,258 [2] 10,270 [1] 9,813 [2] 1,343 [1]
Purchased and accrued interest 422 485                            
Aggregate related fair value of securities with unrealized losses $ 33,589 $ 34,503                            
[1] Included in amortized cost and fair value is purchased and accrued interest of $422
[2] Included in amortized cost and fair value is purchased and accrued interest of $485
[3] The aggregate related fair value of securities with unrealized losses as of December 31, 2012 was $33,589
[4] The aggregate related fair value of securities with unrealized losses as of September 30, 2012 was $34,503.