Finance Charges and Other Revenues (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Summary of the classification of the amounts as Finance charges and other [Abstract]
Interest income and fees on customer receivables	$ 238,386	$ 238,161	$ 211,063
Insurance commissions	42,422	50,789	50,613
Other	1,569	1,639	2,566
Finance charges and other	282,377	290,589	264,242
Provisions for uncollectible interest	40,600	36,700	27,500
Financing Receivable [Member]
Summary of the classification of the amounts as Finance charges and other [Abstract]
Interest income and fees on customer receivables	$ 17,300	$ 14,000	$ 9,100