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Marketable Securities (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Jun. 30, 2012
Securities
Sep. 30, 2011
Jun. 30, 2012
Current Assets [Member]
Sep. 30, 2011
Current Assets [Member]
Jun. 30, 2012
Non-current Assets [Member]
Jun. 30, 2012
Corporate Bonds [Member]
Current Assets [Member]
Sep. 30, 2011
Corporate Bonds [Member]
Current Assets [Member]
Jun. 30, 2012
Corporate Bonds [Member]
Non-current Assets [Member]
Sep. 30, 2011
Corporate Bonds [Member]
Non-current Assets [Member]
Jun. 30, 2012
Commercial Paper [Member]
Current Assets [Member]
Sep. 30, 2011
Commercial Paper [Member]
Current Assets [Member]
Jun. 30, 2012
Certificates of Deposit [Member]
Current Assets [Member]
Sep. 30, 2011
Certificates of Deposit [Member]
Current Assets [Member]
Jun. 30, 2012
Certificates of Deposit [Member]
Non-current Assets [Member]
Jun. 30, 2012
Government Municipal Bonds [Member]
Current Assets [Member]
Sep. 30, 2011
Government Municipal Bonds [Member]
Current Assets [Member]
Jun. 30, 2012
Government Municipal Bonds [Member]
Non-current Assets [Member]
Schedule of Available-for-sale Securities [Line Items]                                  
Number of securities below amortized cost basis 56                                
Number of securities 72                                
Maturity period         15 months                        
Amortized cost $ 71,505 [1] $ 53,280 [2] $ 66,327 [1] $ 51,667 [2] $ 5,178 [1] $ 43,666 [1] $ 22,694 [2] $ 1,831 [1] $ 1,613 [2] $ 4,997 [1] $ 4,998 [2] $ 8,012 [1] $ 8,775 [2] $ 500 [1] $ 9,652 [1] $ 15,200 [2] $ 2,847 [1]
Unrealized gains 14 21 14 21 0 9 18 0 0 1 0 0 0 0 4 3 0
Unrealized losses (75) [3] (174) [4] (59) [3] (164) [4] (16) [3] (54) [3] (144) [4] (14) [3] (10) [4] 0 [3] (3) [4] (5) [3] (9) [4] (1) [3] 0 [3] (8) [4] (1) [3]
Fair Value 71,444 [1] 53,127 [2] 66,282 [1] 51,524 [2] 5,162 [1] 43,621 [1] 22,568 [2] 1,817 [1] 1,603 [2] 4,998 [1] 4,995 [2] 8,007 [1] 8,766 [2] 499 [1] 9,656 [1] 15,195 [2] 2,846 [1]
Purchased and accrued interest 644 478                              
Aggregate related fair value of securities with unrealized losses $ 49,846 $ 43,755                              
[1] Included in amortized cost and fair value is purchased and accrued interest of $644
[2] Included in amortized cost and fair value is purchased and accrued interest of $478
[3] The aggregate related fair value of securities with unrealized losses as of June 30, 2012 was $49,846
[4] The aggregate related fair value of securities with unrealized losses as of September 30, 2011 was $43,755.