Investment in Joint Venture - Summary of Red Iron (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 31, 2020	Jul. 31, 2020	May 01, 2020	Jan. 31, 2020	Oct. 31, 2019	Aug. 02, 2019	May 03, 2019	Feb. 01, 2019	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018
Schedule of Equity Method Investments [Line Items]
Net earnings	$ 72,196	$ 88,968	$ 98,446	$ 70,091	$ 38,266	$ 60,607	$ 115,570	$ 59,540	$ 329,701	$ 273,983	$ 271,939
Total assets	2,853,228				2,330,547				2,853,228	2,330,547	1,570,984
Total liabilities and stockholders' equity	2,853,228				2,330,547				2,853,228	2,330,547
Red Iron Acceptance, LLC | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Schedule of Equity Method Investments [Line Items]
Revenue									31,040	47,569	42,051
Interest and operating expenses, net									(14,177)	(21,011)	(17,288)
Net earnings									16,863	26,558	$ 24,763
Finance receivables, net	386,781				486,834				386,781	486,834
Other assets	2,929				3,733				2,929	3,733
Total assets	389,710				490,567				389,710	490,567
Notes payable	332,838				419,308				332,838	419,308
Other liabilities	12,994				17,594				12,994	17,594
Partners' capital	43,878				53,665				43,878	53,665
Total liabilities and stockholders' equity	$ 389,710				$ 490,567				$ 389,710	$ 490,567