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Business combinations - Pro Forma Results (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021
Business Combination and Asset Acquisition [Abstract] |  |  |  |  |
Revenue | $ 1,335,780 | $ 996,462 | $ 3,566,466 | $ 2,934,920 | $ 4,645,540
Cost of revenue | 1,004,523 | 787,189 | 2,679,170 | 2,283,589 | 3,503,074
Gross profit | 331,257 | 209,273 | 887,296 | 651,331 | 1,142,466
Selling, general, and administrative expenses | 151,321 | 110,754 | 425,062 | 360,370 | 551,143
Amortization of intangible assets | 21,301 | 25,090 | 63,856 | 75,868 | 88,586
Operating income | 158,635 | 73,429 | 398,378 | 215,093 | 502,737
Interest expense | 8,701 | 9,423 | 26,715 | 28,528 | 36,426
Other (expense)/income, net | (7,320) | (2,126) | (10,401) | (11,755) | (11,437)
Income before income taxes | 142,614 | 61,880 | 361,262 | 174,810 | 454,874
Provision for income taxes | 37,123 | 15,549 | 94,735 | 38,897 | 120,248
Net income | $ 105,491 | $ 46,331 | $ 266,527 | $ 135,913 | $ 334,626
Basic earnings per share (in dollars per share) | $ 1.70 | $ 0.75 | $ 4.30 | $ 2.14 | $ 5.40
Diluted earnings per share (in dollars per share) | 1.69 | 0.75 | 4.28 | 2.13 | 5.37
Dividends paid per share (in dollars per share) | $ 0.28 | $ 0.28 | $ 0.84 | $ 0.84 | $ 1.12
Basic (in dollars per share) | 62,064 | 61,882 | 62,028 | 63,463 | 62,001
Diluted (in dollars per share) | 62,453 | 62,102 | 62,300 | 63,666 | 62,285

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