Fair Value Measurements (Tables)

9 Months Ended

May 31, 2019

Fair Value Disclosures [Abstract]

Fair Value Measurements, Recurring and Nonrecurring

	May 31, 2019
	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	$	27,024	$	229,760	$	—	$	256,784
Foreign exchange derivatives	—		9,704		—		9,704
Interest rate swap derivatives	—		4,479		—		4,479
Deferred compensation assets	39,327		—		—		39,327
Embedded derivative asset	—		20,957		—		20,957
Other assets	5,763		—		—		5,763
Total	$	72,114	$	264,900	$	—	$	337,014
Liabilities:
Commodity derivatives	$	76,388	$	239,066	$	—	$	315,454
Foreign exchange derivatives	—		7,480		—		7,480
Interest rate swap derivatives	—		713		—		713
Total	$	76,388	$	247,259	$	—	$	323,647

	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 exchange 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 exchange derivatives	—		24,701		—		24,701
Interest rate swap derivatives	—		9,452		—		9,452
Total	$	31,778	$	424,064	$	—	$	455,842