Finance Charges and Other Revenue (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Apr. 30, 2018 |
Apr. 30, 2017 |
|
| Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items] | ||
| Interest income and fees | $ 76,346 | $ 67,131 |
| Insurance income | 6,271 | 9,330 |
| Other revenues | 14 | 80 |
| Finance charges and other | 82,631 | 76,541 |
| Provisions for uncollectible interest | 11,500 | 10,000 |
| Financing Receivable [Member] | ||
| Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items] | ||
| Interest income and fees | $ 5,800 | $ 4,500 |