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Segment Information - Reportable Segment Information (Details) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2024 segment | Jun. 30, 2024 segment | Dec. 31, 2024 USD ($) branch segment | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Segment Reporting [Abstract] |  |  |  |  |
Number of reportable segments | segment | 4 | 3 | 4 |  |
Number of branches | branch |  |  | 38 |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenue |  |  | $ 1,804,104 | $ 1,570,402 | $ 1,151,422
Cost of goods sold |  |  | 1,190,329 | 1,018,527 | 760,524
Selling, general and administrative expenses |  |  | 557,820 | 508,884 | 349,112
Operating income (loss) |  |  | 55,955 | 42,991 | 41,786
Loss on extinguishment of debt |  |  | 0 | 0 | (3,395)
Change in fair value of earnout liabilities |  |  | (988) | 758 | (483)
Other income (expense), net |  |  | (358) | (2,982) | (670)
Income (loss) before income taxes |  |  | (536) | (2,007) | 12,937
Operating Segments |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Interest expense |  |  | (55,145) | (42,774) | (24,301)
Loss on extinguishment of debt |  |  | 0 | 0 | (3,395)
Change in fair value of earnout liabilities |  |  | (988) | 758 | (483)
Other income (expense), net |  |  | (358) | (2,982) | (670)
Income (loss) before income taxes |  |  | (536) | (2,007) | 12,937
Intersegment elimination |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenue |  |  | (1,942) | (1,700) | 0
Cost of goods sold |  |  | (1,948) | (1,700) | 0
All Other |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Selling, general and administrative expenses |  |  | 5,130 | 5,773 | 2,030
Operating income (loss) |  |  | (5,124) | (5,773) | (2,030)
Lawson |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenue |  |  | 468,976 | 468,379 | 324,783
Lawson | Operating Segments |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenue |  |  | 469,044 | 468,711 | 324,783
Cost of goods sold |  |  | 211,784 | 203,251 | 154,030
Selling, general and administrative expenses |  |  | 242,705 | 232,962 | 164,217
Operating income (loss) |  |  | 14,555 | 32,498 | 6,536
Lawson | Intersegment elimination |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenue |  |  | 68 | 332 | 0
TestEquity |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenue |  |  | 770,866 | 641,643 | 392,358
TestEquity | Operating Segments |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenue |  |  | 771,180 | 641,768 | 392,358
Cost of goods sold |  |  | 595,368 | 499,916 | 302,980
Selling, general and administrative expenses |  |  | 171,845 | 158,317 | 78,003
Operating income (loss) |  |  | 3,967 | (16,465) | 11,375
TestEquity | Intersegment elimination |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenue |  |  | 314 | 125 | 0
Gexpro Services |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenue |  |  | 439,163 | 404,490 | 385,326
Gexpro Services | Operating Segments |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenue |  |  | 440,723 | 405,733 | 385,326
Cost of goods sold |  |  | 302,228 | 284,664 | 272,462
Selling, general and administrative expenses |  |  | 101,962 | 94,069 | 91,573
Operating income (loss) |  |  | 36,533 | 27,000 | 21,291
Gexpro Services | Intersegment elimination |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenue |  |  | 1,560 | 1,243 | 0
Canada Branch Division |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenue |  |  | 125,099 | 55,890 | 48,955
Canada Branch Division | Operating Segments |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenue |  |  | 125,099 | 55,890 | 48,955
Cost of goods sold |  |  | 82,897 | 32,396 | 31,052
Selling, general and administrative expenses |  |  | 36,178 | 17,763 | 13,289
Operating income (loss) |  |  | 6,024 | 5,731 | $ 4,614
Canada Branch Division | Intersegment elimination |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenue |  |  | $ 0 | $ 0 |

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