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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 26, 2026
Sep. 27, 2025
Cash flows from operating activities    
Consolidated net income $ 715,993 $ 618,018
Reconciliation of consolidated net income to net cash provided by operating activities:    
Depreciation and amortization 55,160 51,635
Stock-based compensation expense 23,307 20,328
Provision for credit losses 802 67
Income from unconsolidated affiliates (8,723) (6,140)
Dividends from unconsolidated affiliates 5,701 5,440
Insurance proceeds - noncapital related 0 15,469
Loss (gain) on disposals of assets, net 1,720 (26,654)
Gain on sale of business (41,407) 0
Unrealized gains on short-term investments (10,367) (5,925)
Impairment charges 2,653 2,018
Gain on insurance proceeds (4,352) (41,147)
Deferred income tax expense 17,282 10,627
Changes in assets and liabilities, net of effects of businesses acquired and sold:    
Receivables (253,596) (100,830)
Inventories (95,916) (40,669)
Other assets 3,466 (8,756)
Current liabilities 219,818 120,796
Other liabilities 1,376 286
Other, net (3,952) (330)
Net cash provided by operating activities 628,965 614,233
Cash flows from investing activities    
Capital expenditures (60,764) (48,982)
Acquisition of business, net of cash acquired (135,752) 0
Proceeds from sale of business, net of cash sold 57,004 0
Insurance proceeds - capital related 4,352 4,531
Purchase of short-term investments 0 (26,633)
Purchase of long-term investments (5,834) (781)
Proceeds from sales of assets 62 38,478
Other 0 600
Net cash used in investing activities (140,932) (32,787)
Cash flows from financing activities    
Dividends paid to stockholders of Mueller Industries, Inc. (113,869) (81,723)
Dividends paid to noncontrolling interests (5,051) (12,240)
Repurchase of common stock (278,297) (243,615)
Repayments of debt 0 (185)
Net cash used to settle stock-based awards (24,882) (29,528)
Other 3,100 0
Net cash used in financing activities (418,999) (367,291)
Effect of exchange rate changes on cash (4,214) 9,836
Increase in cash, cash equivalents, and restricted cash 64,820 223,991
Cash, cash equivalents, and restricted cash at the beginning of the period 1,385,157 1,038,895
Cash, cash equivalents, and restricted cash at the end of the period $ 1,449,977 $ 1,262,886