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Marketable Securities (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Mar. 31, 2013
Securities
Sep. 30, 2012
Mar. 31, 2013
Current Assets [Member]
Sep. 30, 2012
Current Assets [Member]
Mar. 31, 2013
Non-current Assets [Member]
Mar. 31, 2013
Corporate Bonds [Member]
Current Assets [Member]
Sep. 30, 2012
Corporate Bonds [Member]
Current Assets [Member]
Mar. 31, 2013
Corporate Bonds [Member]
Non-current Assets [Member]
Sep. 30, 2012
Corporate Bonds [Member]
Non-current Assets [Member]
Mar. 31, 2013
Commercial Paper [Member]
Current Assets [Member]
Sep. 30, 2012
Commercial Paper [Member]
Current Assets [Member]
Mar. 31, 2013
Certificates of Deposit [Member]
Current Assets [Member]
Sep. 30, 2012
Certificates of Deposit [Member]
Current Assets [Member]
Mar. 31, 2013
Certificates of Deposit [Member]
Non-current Assets [Member]
Mar. 31, 2013
Government Municipal Bonds [Member]
Current Assets [Member]
Sep. 30, 2012
Government Municipal Bonds [Member]
Current Assets [Member]
Mar. 31, 2013
Government Municipal Bonds [Member]
Non-current Assets [Member]
Schedule of Available-for-sale Securities [Line Items]                                  
Number of securities below amortized cost basis 61                                
Number of securities 72                                
Maturity period         3 years                        
Amortized cost $ 59,577 [1] $ 60,401 [2] $ 37,420 [1] $ 58,382 [2] $ 22,157 [1] $ 24,036 $ 39,306 $ 15,906 $ 2,019 $ 2,000 $ 2,000 $ 4,758 $ 7,262 $ 6,251 $ 6,626 $ 9,814 $ 0
Unrealized gains 5 15 1 15 4 1 14 4 0 0 0 0 0 0 0 1 0
Unrealized losses (76) [3] (28) [4] (20) [3] (25) [4] (56) [3] (18) (19) (37) (3) 0 0 (2) (4) (19) 0 (2) 0
Fair Value 59,506 [1] 60,388 [2] 37,401 [1] 58,372 [2] 22,105 [1] 24,019 [1] 39,301 [2] 15,873 [1] 2,016 [2] 2,000 [1] 2,000 [2] 4,756 [1] 7,258 [2] 6,232 [1] 6,626 [1] 9,813 [2] 0 [1]
Purchased and accrued interest 500 485                              
Aggregate related fair value of securities with unrealized losses $ 49,320 $ 34,503                              
[1] Included in amortized cost and fair value is purchased and accrued interest of $500
[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 March 31, 2013 was $49,320. These investments have been in an unrealized loss position for less than twelve months.
[4] The aggregate related 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.