Fair Value Measurements (Tables)

3 Months Ended

Nov. 30, 2018

Fair Value Disclosures [Abstract]

Fair Value Measurements, Recurring and Nonrecurring

	November 30, 2018
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(Dollars in thousands)
Assets:
Commodity derivatives	$	27,029	$	158,600	$	—	$	185,629
Foreign currency derivatives	—		15,877		—		15,877
Deferred compensation assets	37,713		—		—		37,713
Embedded derivative asset	—		20,166		—		20,166
Other assets	5,767		—		—		5,767
Total	$	70,509	$	194,643	$	—	$	265,152
Liabilities:
Commodity derivatives	$	40,398	$	248,122	$	—	$	288,520
Foreign currency derivatives	—		9,471		—		9,471
Interest rate swap derivatives	—		10,407		—		10,407
Total	$	40,398	$	268,000	$	—	$	308,398

	August 31, 2018
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(Dollars in thousands)
Assets:
Commodity derivatives	$	54,487	$	259,359	$	—	$	313,846
Foreign currency derivatives	—		15,401		—		15,401
Deferred compensation assets	39,073		—		—		39,073
Embedded derivative asset	—		23,595		—		23,595
Other assets	5,334		—		—		5,334
Total	$	98,894	$	298,355	$	—	$	397,249
Liabilities:
Commodity derivatives	$	31,778	$	389,911	$	—	$	421,689
Foreign currency derivatives	—		24,701		—		24,701
Interest rate swap derivatives	—		9,452		—		9,452
Total	$	31,778	$	424,064	$	—	$	455,842