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Investments (Amortized Cost and Fair Value of Held to Maturity Investments) (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Sep. 30, 2014
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 49,496 $ 57,163
Gross Unrealized Gains 16 28
Gross Unrealized Losses (25) (37)
Estimated Fair Market Value 49,487 57,154
Municipal bonds, due in less than 1 year    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 20,710 26,894
Gross Unrealized Gains 12 20
Gross Unrealized Losses 0 0
Estimated Fair Market Value 20,722 26,914
Corporate bonds, due in less than 1 year    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 19,172 16,836
Gross Unrealized Gains 0 1
Gross Unrealized Losses (21) (24)
Estimated Fair Market Value 19,151 16,813
Certificates of deposit, due in less than 1 year    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 4,612 2,176
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Estimated Fair Market Value 4,612 2,176
Municipal bonds, due in 1 - 2 years    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 2,854 4,230
Gross Unrealized Gains 3 7
Gross Unrealized Losses (2) 0
Estimated Fair Market Value 2,855 4,237
Corporate bonds due In 1 - 2 years    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 1,401 4,054
Gross Unrealized Gains 1 0
Gross Unrealized Losses (2) (13)
Estimated Fair Market Value 1,400 4,041
Certificates of deposit, due in 1- 2 years    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 747 2,973
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Estimated Fair Market Value $ 747 $ 2,973