CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical) - USD ($) $ in Thousands	Apr. 30, 2017	Jan. 31, 2017
Assets, Noncurrent [Abstract]
Customer accounts receivable, net of allowances (includes VIE balance of $430,855 and $529,108, respectively)		$ 702,162
Long-term customer accounts receivable, net		$ 615,904
Stockholders' equity
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	31,004,000	30,962,000
Variable Interest Entity
Assets, Noncurrent [Abstract]
Customer accounts receivable, net of allowances (includes VIE balance of $430,855 and $529,108, respectively)	$ 581,679	$ 529,108
Long-term customer accounts receivable, net	474,474	320,382
Long-term Debt	$ 981,836	$ 745,581