Marketable Securities Narrative (Details) - USD ($)	3 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Marketable securities sold during period, fair value	$ 124,000,000
Marketable securities sold during period, amortized cost basis	124,200,000
Gross realized losses	141,000
Gross realized gains	3,000
Proceeds from sale of marketable securities	123,500,000
Change in net unrealized holding gain (loss) included in AOCI	138,000
Gross unrealized losses	17,000	$ 102,300
Gross unrealized gains	$ 19,000	$ 65,000