| In millions, except per share items | Apr-30-19 | Apr-30-18 | Apr-30-17 | Apr-30-16 | Apr-30-15 | Apr-30-14 | Apr-30-13 | Apr-30-12 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Sales | 669.1 | 612.2 | 587.8 | 567.9 | 530.3 | 489.2 | 464.7 | 430.2 |
| Sales growth | 9.3% | 4.2% | 3.5% | 7.1% | 8.4% | 5.3% | 8.0% | 13.4% |
| Interest and other income | 82.6 | 74.7 | 67.6 | 61.4 | 57.8 | 54.7 | 48.9 | 43.3 |
| Total revenues | 669.1 | 612.2 | 587.8 | 567.9 | 530.3 | 489.2 | 464.7 | 430.2 |
| Total revenues growth | 9.3% | 4.2% | 3.5% | 7.1% | 8.4% | 5.3% | 8.0% | 13.4% |
| Costs and expenses: | | | | | | | | |
| Selling, general and administrative | 107.2 | 99.0 | 91.9 | 92.2 | 83.8 | 78.6 | 73.2 | 67.7 |
| Provision for credit losses | 146.4 | 149.1 | 149.1 | 144.4 | 120.3 | 119.2 | 96.0 | 81.6 |
| Interest expense | -7.9 | -5.6 | -4.1 | -3.3 | -2.9 | -3.0 | | |
| Depreciation and amortization | 4.0 | 4.3 | 4.3 | 4.2 | 3.8 | 3.3 | 2.8 | 2.3 |
| Loss (gain) on disposal of property and equipment | -0.1 | 0.1 | 1.2 | 0.4 | 0.0 | 0.1 | 0.1 | 0.1 |
| Total costs and expenses | 609.3 | 573.3 | 555.5 | 549.4 | 483.3 | 455.5 | 414.0 | 377.4 |
| Income before taxes | 59.9 | 38.9 | 32.2 | 18.5 | 47.0 | 33.7 | 50.7 | 52.8 |
| Provision for income taxes | 12.2 | 2.4 | 12.0 | 6.9 | 17.5 | 12.5 | 18.5 | 19.8 |
| Net income | 47.6 | 36.5 | 20.2 | 11.6 | 29.5 | 21.1 | 32.2 | 33.0 |
| Less: Dividends on mandatorily redeemable preferred stock | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | | |
| Net income attributable to common stockholders | 47.6 | 36.5 | 20.2 | 11.6 | 29.5 | 21.1 | 32.1 | 32.9 |
| |
| Earnings per share: | | | | | | | | |
| Basic (in dollars per share) | $6.99 | $5.04 | $2.57 | $1.38 | $3.42 | $2.36 | $3.53 | $3.36 |
| Diluted (in dollars per share) | $6.73 | $4.90 | $2.49 | $1.33 | $3.25 | $2.25 | $3.36 | $3.24 |
| |
| Weighted average number of shares used in calculation: | | | | | | | | |
| Basic (in shares) | 6.8 | 7.2 | 7.9 | 8.4 | 8.6 | 8.9 | 9.1 | 9.8 |
| Diluted (in shares) | 7.1 | 7.4 | 8.1 | 8.7 | 9.0 | 9.4 | 9.6 | 10.2 |