| Condensed Consolidated Statements of Income [Abstract] | |
| Sales | 347.04M |
| Operating costs and expenses: | |
| Cost of sales | 149.81M |
| Selling and administrative expenses | 135.08M |
| Total operating costs and expenses | 285.48M |
| Operating profit | 61.56M |
| Other income (expense): | |
| Interest expense | -4.08M |
| Interest and investment income | 98K |
| Other - net | -1.2M |
| Total other income (expense) | -5.18M |
| Income before income taxes | 56.38M |
| Income taxes | 14.37M |
| Net income | 42.01M |
| Average common shares | 64.27M |
| Incremental common shares attributable to outstanding stock options, nonvested stock, and deferred stock-based compensation | 676K |
| Average common shares and common share equivalents | 64.95M |
| Basic earnings per share | 0.65 |
| Diluted earnings per share | 0.65 |
| Dividends declared per share | 0.15 |