Debt (Tables)

12 Months Ended

Sep. 30, 2016

Debt Disclosure [Abstract]

Composition of Long Term Debt

Long-term debt comprises the following at September 30:

	2016			2015
Senior Notes:
4.12%, due September 2046	$	200,000		$	—
5.75%, due September 2016	—			175,000
4.98%, due March 2044	175,000			175,000
2.95%, due June 2026	100,000			—
6.21%, due September 2036	100,000			100,000
Medium-Term Notes:
7.37%, due October 2015	—			22,000
5.64%, due December 2015	—			50,000
6.17%, due June 2017	20,000			20,000
7.25%, due November 2017	20,000			20,000
5.67%, due January 2018	20,000			20,000
6.50%, due August 2033	20,000			20,000
6.13%, due October 2034	20,000			20,000
Total long-term debt	675,000			622,000
Less: unamortized debt issuance costs (a)	(3,559		)	(2,194		)
Less: current maturities	(19,986		)	(246,893		)
Total long-term debt due after one year	$	651,455		$	372,913

(a) Prior-year amounts reflect the retrospective impact from the adoption of new accounting guidance regarding the classification of debt issuance costs (see Note 3).