Accumulated Other Comprehensive Income (Schedule of Reclassification out of Accumulated Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Gain on sale of investments	$ 3,121	$ 0
Provision for income taxes	(1,643)	(1,159)
Consolidated net income	5,446	2,488
Amount Reclassified from Accumulated Other Comprehensive Income | Unrealized Holding Gains (Losses) on Available-for-Sale Investments
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Gain on sale of investments	3,669	0
Provision for income taxes	(1,373)	0
Consolidated net income	$ 2,296	$ 0