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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Net income		$ 39,704	$ 55,209	$ 57,979	$ 67,267
Other comprehensive income:
Unrealized gain on pension plan obligation	[1]	532	648	1,066	1,296
Tax effect of unrealized gain on pension plan		(216)	(268)	(432)	(535)
Total other comprehensive income		316	380	634	761
Total comprehensive income		$ 40,020	$ 55,589	$ 58,613	$ 68,028
[1] This item is included in the computation of net periodic pension cost.

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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