Accumulated Other Comprehensive Loss (Schedule of Reclassification out of Accumulated Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Gain on sale of investments	$ 0	$ 3,121
Provision for income taxes	(926)	(1,643)
Consolidated net income	3,236	5,446
Amount Reclassified from Accumulated Other Comprehensive Loss | Unrealized holding gains on available-for -sale investments
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Gain on sale of investments	0	3,669
Provision for income taxes	0	(1,373)
Consolidated net income	$ 0	$ 2,296