| In millions, except per share items | Dec-31-14 | Sep-28-14 | Jun-29-14 | Mar-30-14 | Dec-29-13 | Sep-29-13 | Jun-30-13 | Mar-31-13 |
| | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q |
| Continuing operations: | | | | | | | | |
| Revenue: | | | | | | | | |
| Total revenue | 122.0 | 105.1 | 104.7 | 96.6 | 107.4 | 96.9 | 99.8 | 93.2 |
| Total revenue growth | 13.6% | 8.5% | 4.9% | 3.7% | -8.7% | -0.9% | 4.5% | 13.3% |
| Operating costs and expenses: | | | | | | | | |
| Total operating costs and expenses | | 57.6 | 54.1 | 53.9 | | 56.6 | 54.4 | 52.4 |
| Selling and administrative expenses | 34.4 | 33.4 | 33.1 | 30.8 | 31.6 | 30.2 | 32.4 | 32.5 |
| Total operating costs and expenses and selling and administrative expenses | 552.0 | 91.0 | 87.3 | 84.6 | 532.8 | 86.8 | 86.8 | 84.9 |
| Operating earnings | 28.2 | 14.2 | 17.4 | 12.0 | 19.9 | 10.1 | 13.0 | 8.3 |
| Operating margin | 23.1% | 13.5% | 16.7% | 12.4% | 18.6% | 10.4% | 13.0% | 8.9% |
| |
| Other income and (expense): | | | | | | | | |
| Interest income | | | | | | | | |
| Interest expense | -1.3 | -1.4 | -1.6 | -1.6 | -1.8 | -1.9 | -1.9 | -2.1 |
| Other | | | | 1.6 | | | -0.2 | 2.1 |
| Total other income and (expense) | | | | -1.6 | | | 0.2 | -2.1 |
| Earnings from continuing operations before income taxes | | 12.7 | 15.9 | 10.3 | | 8.2 | 10.9 | 6.2 |
| Provision for income taxes | 11.2 | 5.7 | 5.4 | 4.2 | 7.1 | 3.2 | 4.4 | 2.5 |
| Earnings from continuing operations | | 7.0 | 10.4 | 6.2 | | 5.0 | 6.5 | 3.7 |
| Earnings from discontinued operations, net of applicable income tax expense of $4,114, ($13) and $518, respectively | | 0.0 | 0.0 | 6.0 | 0.0 | -0.4 | 0.1 | 0.1 |
| Net earnings | 15.6 | 7.0 | 10.4 | 12.2 | 11.3 | 4.5 | 6.6 | 3.8 |
| |
| Earnings per share: | | | | | | | | |
| Basic - Class A and B common stock: | | | | | | | | |
| Continuing operations (in dollars per share) | | | | | | | | |
| Discontinued operations (in dollars per share) | | | | | | | | |
| Net earnings (in dollars per share) | $0.31 | $0.14 | $0.21 | $0.24 | $0.22 | $0.09 | $0.13 | $0.08 |
| |
| Diluted - Class A and B common stock: | | | | | | | | |
| Continuing operations (in dollars per share) | | | | | | | | |
| Discontinued operations (in dollars per share) | | | | | | | | |
| Net earnings (in dollars per share) | $0.30 | $0.14 | $0.21 | $0.24 | $0.22 | $0.09 | $0.13 | $0.08 |
| |
| Basic and diluted - Class C common stock: | | | | | | | | |
| Continuing operations (in dollars per share) | | | | | | | | |
| Discontinued operations (in dollars per share) | | | | | | | | |
| Net earnings (in dollars per share) | | | | | | | | |