| CONSOLIDATED STATEMENTS OF INCOME [Abstract] | |
| Net sales | 514.17M |
| Cost of goods sold | 449.72M |
| Depreciation and amortization | 7.87M |
| Selling, general, and administrative expense | 32.12M |
| Insurance settlement | 0 |
| Litigation settlement | |
| Operating income | 24.46M |
| Interest expense | -353K |
| Other income (expense), net | 219K |
| Income before income taxes | 24.32M |
| Income tax expense | -8.75M |
| Consolidated net income | 15.57M |
| Net income attributable to noncontrolling interest | -59K |
| Net income attributable to Mueller Industries, Inc. | 15.51M |
| Weighted average shares for basic earnings per share | 37.51M |
| Effect of dilutive stock-based awards | 452K |
| Adjusted weighted average shares for diluted earnings per share | 37.96M |
| Basic earnings per share | 0.41 |
| Diluted earnings per share | 0.41 |
| Dividends per share | 0.1 |