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Marketable Securities (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2015
USD ($)
Security
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Security
Jun. 30, 2014
USD ($)
Schedule of Available-for-sale Securities [Line Items]        
Number of securities below amortized cost basis 25   25  
Number of securities 63   63  
Proceeds from maturities of marketable securities | $ $ 8,700 $ 21,600 $ 28,494 $ 35,364
Current Assets        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale securities, next twelve months, maximum year mature     1 year  
Non-current Assets        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale securities, year two through five, maximum year mature     3 years