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Debt and Capital Lease Obligations - Schedule of Debt and Capital Lease Obligations (Details) - USD ($)
$ in Thousands
Jul. 31, 2017
Mar. 31, 2017
Jan. 31, 2017
Long-term debt [Abstract]      
Capital lease obligations $ 5,439   $ 2,393
Total debt and capital lease obligations 1,071,261   1,159,184
Less:      
Discount on debt (2,808)   (3,089)
Deferred debt issuance costs (6,827)   (10,853)
Current maturities of capital lease obligations (906)   (849)
Long-term debt and capital lease obligations 1,060,720   1,144,393
Senior Notes [Member]      
Long-term debt [Abstract]      
Long-term Debt 227,000   227,000
2015-A Class A Notes [Member] | Secured Debt [Member]      
Long-term debt [Abstract]      
Long-term Debt 0   12,166
2015-A Class B Notes [Member] | Secured Debt [Member]      
Long-term debt [Abstract]      
Long-term Debt 0   165,900
Class A Notes [Member] | Secured Debt [Member]      
Long-term debt [Abstract]      
Long-term Debt 0   64,732
Class B Notes [Member] | Secured Debt [Member]      
Long-term debt [Abstract]      
Long-term Debt 30,618   70,510
2016-A Class C Notes [Member] | Secured Debt [Member]      
Long-term debt [Abstract]      
Long-term Debt 70,510   70,510
2016-B Class A Notes [Member] | Secured Debt [Member]      
Long-term debt [Abstract]      
Long-term Debt 66,292   256,513
2016-B Class B Notes [Member] | Secured Debt [Member]      
Long-term debt [Abstract]      
Long-term Debt 111,960   111,960
2017-A Class A Notes [Member] | Secured Debt [Member]      
Long-term debt [Abstract]      
Long-term Debt 202,832   0
2017-A Class B Notes [Member] | Secured Debt [Member]      
Long-term debt [Abstract]      
Long-term Debt 106,270   0
2017-A Class C Notes [Member] | Secured Debt [Member]      
Long-term debt [Abstract]      
Long-term Debt 50,340   0
Revolving Credit Facility [Member]      
Less:      
Deferred debt issuance costs (6,700)   (5,700)
Revolving Credit Facility [Member] | Line of Credit [Member]      
Long-term debt [Abstract]      
Long-term Debt $ 200,000   $ 177,500
Less:      
Deferred debt issuance costs   $ (2,800)