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Investments (Amortized Cost and Fair Value of Held to Maturity Investments) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Sep. 30, 2015
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 10,149 $ 29,805
Gross Unrealized Gains 3 17
Gross Unrealized Losses (1) (11)
Estimated Fair Market Value 10,151 29,811
Municipal bonds, due in less than 1 year    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 4,851 13,117
Gross Unrealized Gains 2 14
Gross Unrealized Losses 0 (1)
Estimated Fair Market Value 4,853 13,130
Corporate bonds, due in less than 1 year    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 3,960 11,402
Gross Unrealized Gains 1 1
Gross Unrealized Losses (1) (10)
Estimated Fair Market Value 3,960 11,393
Certificates of deposit, due in less than 1 year    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 1,291 3,567
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Estimated Fair Market Value 1,291 3,567
Municipal bonds, due in 1 - 2 years    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 47 771
Gross Unrealized Gains 0 2
Gross Unrealized Losses 0 0
Estimated Fair Market Value $ 47 773
Corporate bonds due In 1 - 2 years    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost   201
Gross Unrealized Gains   0
Gross Unrealized Losses   0
Estimated Fair Market Value   201
Certificates of deposit, due in 1- 2 years    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost   747
Gross Unrealized Gains   0
Gross Unrealized Losses   0
Estimated Fair Market Value   $ 747