Debt (Tables)

9 Months Ended

Jun. 30, 2017

Debt

Schedule of components of unsecured long-term debt outstanding

					Unamortized Discount and
	Principal				Debt Issuance Costs
	June 30,		September 30,		June 30,		September 30,
	2017		2016		2017		2016
	(in thousands)
Unsecured senior notes issued March 19, 2015:
Due March 19, 2025	$	500,000	$	500,000	$	(7,363)	$	(8,153)
		500,000		500,000		(7,363)		(8,153)
Less long-term debt due within one year		—		—		—		—
Long-term debt	$	500,000	$	500,000	$	(7,363)	$	(8,153)