CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 151,080	$ 129,719	$ 310,683	$ 274,005
Other comprehensive income, net of income taxes:
Unrealized appreciation on securities, net of income taxes of $21.9 million and $21.8 million at March 31, 2013 and $15.9 million and $35.3 million at March 31, 2012	37,516	26,479	37,382	58,817
Minimum pension liability adjustments, net of income taxes of $0.3 million and $0.5 million at March 31, 2013 and $0.3 million and $0.6 million at March 31, 2012	432	540	865	1,079
Other comprehensive income	37,948	27,019	38,247	59,896
Comprehensive income	$ 189,028	$ 156,738	$ 348,930	$ 333,901