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Segment Reporting (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023 | Sep. 30, 2022
Operations of the Company's operating segments |  |  |  |  |  |
Net Sales to External Customers | $ 946,750 | $ 982,117 | $ 1,872,699 | $ 1,910,855 |  |
Revenue Transactions With Other Operating Segments | 0 | 0 | 0 | 0 |  |
Net Sales | 946,750 | 982,117 | 1,872,699 | 1,910,855 |  |
Segment Profit | 284,101 | 307,704 | 551,429 | 574,155 |  |
Goodwill | 665,359 |  | 665,359 |  | $ 670,108 | $ 665,100
Swiss Operations [Member] |  |  |  |  |  |
Operations of the Company's operating segments |  |  |  |  |  |
Net Sales to External Customers | 50,185 | 46,803 | 104,435 | 93,172 |  |
Revenue Transactions With Other Operating Segments | 169,194 | 181,073 | 392,565 | 383,207 |  |
Net Sales | 219,379 | 227,876 | 497,000 | 476,379 |  |
Segment profit | 55,804 | 66,914 | 114,890 | 143,336 |  |
Goodwill | 25,841 |  | 25,841 |  |  | 25,865
Western European Operations [Member] |  |  |  |  |  |
Operations of the Company's operating segments |  |  |  |  |  |
Net Sales to External Customers | 202,313 | 192,075 | 417,078 | 391,499 |  |
Revenue Transactions With Other Operating Segments | 42,171 | 47,766 | 89,909 | 92,642 |  |
Net Sales | 244,484 | 239,841 | 506,987 | 484,141 |  |
Segment profit | 45,124 | 38,747 | 95,435 | 83,270 |  |
Goodwill | 99,401 |  | 99,401 |  |  | 100,452
Chinese Operations [Member] |  |  |  |  |  |
Operations of the Company's operating segments |  |  |  |  |  |
Net Sales to External Customers | 164,384 | 221,669 | 307,582 | 407,437 |  |
Revenue Transactions With Other Operating Segments | 81,894 | 67,279 | 162,536 | 127,731 |  |
Net Sales | 246,278 | 288,948 | 470,118 | 535,168 |  |
Segment profit | 99,496 | 119,722 | 175,319 | 200,963 |  |
Goodwill | 601 |  | 601 |  |  | 603
Other Operations [Member] |  |  |  |  |  |
Operations of the Company's operating segments |  |  |  |  |  |
Net Sales to External Customers | 167,653 | 162,455 | 335,266 | 322,231 |  |
Revenue Transactions With Other Operating Segments | 7,604 | 13,601 | 10,936 | 14,559 |  |
Net Sales | 175,257 | 176,056 | 346,202 | 336,790 |  |
Segment profit | 24,628 | 24,440 | 49,810 | 48,683 |  |
Goodwill | 13,131 |  | 13,131 |  |  | 13,721
Intersegment Elimination [Member] |  |  |  |  |  |
Operations of the Company's operating segments |  |  |  |  |  |
Net Sales to External Customers | 0 | 0 | 0 | 0 |  |
Revenue Transactions With Other Operating Segments | (336,880) | (343,460) | (729,381) | (685,128) |  |
Net Sales | (336,880) | (343,460) | (729,381) | (685,128) |  |
Segment profit | (41,198) | (46,325) | (77,908) | (88,097) |  |
Goodwill | 0 |  | 0 |  |  | 0
US Operations [Member] |  |  |  |  |  |
Operations of the Company's operating segments |  |  |  |  |  |
Net Sales to External Customers | 362,215 | 359,115 | 708,338 | 696,516 |  |
Revenue Transactions With Other Operating Segments | 36,017 | 33,741 | 73,435 | 66,989 |  |
Net Sales | 398,232 | 392,856 | 781,773 | 763,505 |  |
Segment profit | 100,247 | $ 104,206 | 193,883 | $ 186,000 |  |
Goodwill | $ 526,385 |  | $ 526,385 |  |  | $ 524,459

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