Debt and Financing Lease Obligations - Schedule of Debt and Capital Lease Obligations (Details) - USD ($) $ in Thousands	Apr. 30, 2020	Jan. 31, 2020
Long-term debt [Abstract]
Long-term debt	$ 611,498
Financing lease obligations	5,807	$ 5,209
Total debt and financing lease obligations	1,180,305	1,034,341
Less:
Discount on debt	(1,264)	(1,404)
Deferred debt issuance costs	(5,282)	(6,797)
Current maturities of long-term debt and financing lease obligations	(772)	(605)
Long-term debt and financing lease obligations	1,172,987	1,025,535
2017-B Class C Notes [Member]
Long-term debt [Abstract]
Long-term debt	35,421
2018-A VIE Class A Notes [Member]
Long-term debt [Abstract]
Long-term debt	23,016
2018-A VIE Class B Notes [Member]
Long-term debt [Abstract]
Long-term debt	13,880
2018-A VIE Class C Notes [Member]
Long-term debt [Abstract]
Long-term debt	13,880
2019-A VIE Class A Notes [Member]
Long-term debt [Abstract]
Long-term debt	46,906
2019-A VIE Class B Notes [Member]
Long-term debt [Abstract]
Long-term debt	60,239
2019-A VIE Class C Notes [Member]
Long-term debt [Abstract]
Long-term debt	58,155
2019-B VIE Class A Notes [Member]
Long-term debt [Abstract]
Long-term debt	191,191
2019-B VIE Class B Notes [Member]
Long-term debt [Abstract]
Long-term debt	85,540
2019-B VIE Class C Notes [Member]
Long-term debt [Abstract]
Long-term debt	83,270
Senior Notes [Member]
Long-term debt [Abstract]
Long-term debt	227,000	227,000
Secured Debt [Member]
Long-term debt [Abstract]
Long-term debt	611,500
Secured Debt [Member] \| 2017-B Class C Notes [Member]
Long-term debt [Abstract]
Long-term debt	35,421	59,655
Secured Debt [Member] \| 2018-A VIE Class A Notes [Member]
Long-term debt [Abstract]
Long-term debt	23,016	34,112
Secured Debt [Member] \| 2018-A VIE Class B Notes [Member]
Long-term debt [Abstract]
Long-term debt	13,880	20,572
Secured Debt [Member] \| 2018-A VIE Class C Notes [Member]
Long-term debt [Abstract]
Long-term debt	13,880	20,572
Secured Debt [Member] \| 2019-A VIE Class A Notes [Member]
Long-term debt [Abstract]
Long-term debt	46,906	76,241
Secured Debt [Member] \| 2019-A VIE Class B Notes [Member]
Long-term debt [Abstract]
Long-term debt	60,239	64,750
Secured Debt [Member] \| 2019-A VIE Class C Notes [Member]
Long-term debt [Abstract]
Long-term debt	58,155	62,510
Secured Debt [Member] \| 2019-B VIE Class A Notes [Member]
Long-term debt [Abstract]
Long-term debt	191,191	265,810
Secured Debt [Member] \| 2019-B VIE Class B Notes [Member]
Long-term debt [Abstract]
Long-term debt	85,540	85,540
Secured Debt [Member] \| 2019-B VIE Class C Notes [Member]
Long-term debt [Abstract]
Long-term debt	83,270	83,270
Revolving Credit Facility [Member]
Less:
Deferred debt issuance costs	(3,200)	(3,500)
Revolving Credit Facility [Member] \| Line of Credit [Member]
Long-term debt [Abstract]
Long-term debt	$ 336,000	$ 29,100

Less [Abstract]

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Amount, after accumulated amortization, of debt discount (premium).

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Present value of lessee's discounted obligation for lease payments from finance lease.

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