Marketable Securities (Details) $ in Thousands	9 Months Ended
	Jun. 30, 2016 USD ($) Security	Jun. 30, 2015 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Number of securities below amortized cost basis	22
Number of securities	61
Proceeds from maturities of marketable securities | $	$ 46,664	$ 28,494
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