Fair Value Measurements (Tables)

3 Months Ended

Nov. 30, 2019

Fair Value Disclosures [Abstract]

Fair Value Measurements, Recurring and Nonrecurring

	November 30, 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	$	26,343	$	159,387	$	—	$	185,730
Foreign exchange derivatives	—		5,606		—		5,606
Interest rate swap derivatives	—		6,886		—		6,886
Deferred compensation assets	46,754		—		—		46,754
Embedded derivative asset	—		17,933		—		17,933
Segregated investments	91,080		—		—		91,080
Other assets	6,082		—		—		6,082
Total	$	170,259	$	189,812	$	—	$	360,071
Liabilities
Commodity derivatives	$	36,032	$	152,380	$	—	$	188,412
Foreign exchange derivatives	—		19,297		—		19,297
Total	$	36,032	$	171,677	$	—	$	207,709

	August 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	$	67,817	$	180,392	$	—	$	248,209
Foreign exchange derivatives	—		10,339		—		10,339
Interest rate swap derivatives	—		9,841		—		9,841
Deferred compensation assets	40,368		—		—		40,368
Embedded derivative asset	—		21,364		—		21,364
Segregated investments	77,777		—		—		77,777
Other assets	6,519		—		—		6,519
Total	$	192,481	$	221,936	$	—	$	414,417
Liabilities
Commodity derivatives	$	40,305	$	188,455	$	—	$	228,760
Foreign exchange derivatives	—		20,701		—		20,701
Total	$	40,305	$	209,156	$	—	$	249,461