| In millions, except per share items | Sep-24-17 | Jun-25-17 | Mar-26-17 | Dec-25-16 | Sep-25-16 | Jun-26-16 | Mar-27-16 | Dec-27-15 |
| | 10-Q | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K |
| Revenue: | | | | | | | | |
| Restaurant sales | 473.0 | | | | 470.6 | | | |
| Franchise royalties and fees | 23.7 | 24.3 | 25.6 | 23.7 | 23.5 | 23.6 | 24.3 | 23.8 |
| Total revenue | 496.7 | 500.0 | 534.8 | 494.2 | 494.2 | 490.2 | 508.3 | 490.2 |
| Total revenue growth | 0.5% | 2.0% | 5.2% | 0.8% | 8.5% | 15.0% | 15.4% | 19.9% |
| Costs and expenses: | | | | | | | | |
| Restaurant operating costs: | | | | | | | | |
| Cost of sales | 145.6 | 152.7 | 160.0 | 146.2 | 136.2 | 138.5 | 143.8 | 137.4 |
| Labor | 148.4 | 154.3 | 161.0 | 149.7 | 150.8 | 149.4 | 149.1 | 144.3 |
| Operating | 72.0 | 74.6 | 77.5 | 73.8 | 73.4 | 68.2 | 69.7 | 72.0 |
| Occupancy | 28.4 | 28.1 | 28.5 | 27.5 | 27.4 | 27.2 | 26.7 | 26.0 |
| Depreciation and amortization | 37.8 | 38.1 | 38.9 | 38.3 | 38.3 | 38.0 | 37.5 | 36.6 |
| General and administrative | 31.1 | 39.2 | 32.8 | 29.4 | 32.3 | 29.8 | 31.7 | 31.2 |
| Preopening | 0.9 | 0.9 | 0.6 | 3.5 | 1.5 | 1.8 | 1.9 | 4.9 |
| Loss on asset disposals and impairment | 4.1 | 2.6 | 1.7 | | 1.4 | 1.9 | 1.2 | |
| Total costs and expenses | 468.3 | 490.6 | 501.0 | 472.4 | 461.3 | 454.7 | 461.7 | 455.7 |
| Income from operations | 28.4 | 9.4 | 33.8 | 21.8 | 32.8 | 35.5 | 46.6 | 34.5 |
| Operating margin | 5.7% | 1.9% | 6.3% | 4.4% | 6.6% | 7.2% | 9.2% | 7.0% |
| Interest expense | -3.8 | -3.3 | -2.4 | | -0.9 | -0.8 | -0.8 | |
| Other income | -0.2 | 5.9 | -1.2 | | -0.4 | -1.0 | 0.9 | |
| Earnings before income taxes | 24.8 | 12.0 | 30.3 | 21.5 | 32.3 | 33.6 | 46.6 | 33.6 |
| Income tax expense | 6.8 | 3.3 | 8.9 | 6.0 | 9.8 | 10.0 | 14.0 | 8.3 |
| Tax rate | 27.3% | 27.9% | 29.3% | 27.9% | 30.4% | 29.9% | 29.9% | 24.7% |
| Net earnings including noncontrolling interests | 18.0 | 8.6 | 21.4 | 15.5 | 22.5 | 23.5 | 32.7 | 25.3 |
| Net loss attributable to noncontrolling interests | -0.1 | -0.1 | -0.2 | -0.1 | -0.1 | -0.2 | -0.1 | 0.0 |
| Net earnings attributable to Buffalo Wild Wings | 18.2 | 8.8 | 21.5 | 15.6 | 22.7 | 23.7 | 32.8 | 25.3 |
| |
| Earnings per common share – basic (in Dollars per share) | $1.17 | $0.55 | $1.26 | $0.89 | $1.24 | $1.27 | $1.73 | $1.33 |
| Earnings per common share – diluted (in Dollars per share) | $1.17 | $0.55 | $1.25 | $0.88 | $1.23 | $1.27 | $1.73 | $1.32 |
| |
| Weighted average shares outstanding – basic (in Shares) | 15.5 | 16.0 | 17.2 | 18.4 | 18.3 | 18.6 | 18.9 | 19.0 |
| Weighted average shares outstanding – diluted (in Shares) | 15.6 | 16.0 | 17.2 | 18.5 | 18.4 | 18.6 | 19.0 | 19.1 |