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Business combinations - Pro Forma Results (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020
Business Combination and Asset Acquisition [Abstract] |  |
Revenue | $ 4,672,597 | $ 4,013,994
Cost of revenue | 3,566,894 | 3,107,493
Gross profit | 1,105,703 | 906,501
Selling, general, and administrative expenses | 553,048 | 485,903
Amortization of intangible assets | 85,621 | 101,467
Operating income | 467,034 | 319,131
Interest expense | (37,410) | (38,239)
Other expense, net | (2,414) | (12,791)
Income before income taxes | 427,210 | 268,101
Provision for income taxes | 102,045 | 64,328
Net income | $ 325,165 | $ 203,773
Basic (in dollars per share) | $ 5.24 | $ 3.23
Diluted (in dollars per share) | $ 5.21 | $ 3.22
Basic (in shares) | 62,072 | 63,062
Diluted (in shares) | 62,365 | 63,322

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