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Quarterly Financial Information-Unaudited (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Quarterly Financial Information-Unaudited |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 3,353,800 | $ 3,408,400 | $ 3,265,500 | $ 3,313,200 | $ 3,569,000 | $ 3,189,700 | $ 3,245,700 | $ 3,235,600 | $ 13,340,852 | $ 13,239,976 | $ 13,642,455
Cost of revenue | 3,136,600 | 3,206,800 | 3,070,300 | 3,128,800 | 3,379,100 | 3,004,600 | 3,076,900 | 3,069,800 | 12,542,431 | 12,530,416 | 13,030,800
Gross profit | 217,200 | 201,600 | 195,200 | 184,400 | 189,900 | 185,100 | 168,800 | 165,800 | 798,421 | 709,560 | 611,655
Equity in earnings of joint ventures | 11,400 | 8,200 | 7,200 | 8,200 | 16,800 | 8,600 | 13,500 | 9,900 | 35,044 | 48,781 | 49,320
General and administrative expenses | (44,300) | (36,300) | (36,000) | (38,400) | (49,500) | (54,500) | (41,000) | (43,600) | (155,072) | (188,535) | (148,123)
Restructuring costs | (14,000) | (13,000) | (8,800) | (13,000) | (91,900) | (20,300) | (31,200) | (44,900) | (48,840) | (188,345) | (95,446)
Impairment of long-lived assets |  |  |  |  |  |  |  |  |  |  | (24,900)
Gain on disposal activities |  |  |  |  |  |  |  |  |  |  | 3,590
Income from operations | 170,300 | 160,500 | 157,600 | 141,200 | 65,300 | 118,900 | 110,100 | 87,200 | 629,553 | 381,461 | 396,096
Other income | 5,700 | 4,500 | 3,500 | 3,900 | 1,600 | 3,100 | 2,400 | 4,000 | 17,603 | 11,056 | 14,556
Interest expense | (25,900) | (149,000) | (32,800) | (30,700) | (47,500) | (35,000) | (37,100) | (40,400) | (238,352) | (159,914) | (161,482)
Income from continuing operations before taxes | 150,100 | 16,000 | 128,300 | 114,400 | 19,400 | 87,000 | 75,400 | 50,800 | 408,804 | 232,603 | 249,170
Income tax expense (benefit) for continuing operations | 46,100 | (17,800) | 35,100 | 25,600 | 15,300 | (7,200) | 21,700 | 15,900 | 89,011 | 45,753 | 13,498
Net income from continuing operations | 104,000 | 33,800 | 93,200 | 88,800 | 4,100 | 94,200 | 53,700 | 34,900 | 319,793 | 186,850 | 235,672
Net loss from discontinued operations | 2,300 | (15,400) | (47,900) | (55,800) | (228,000) | (100) | (130,700) | 18,200 | (116,813) | (340,591) | (419,662)
Net income (loss) | 106,300 | 18,400 | 45,300 | 33,000 | (223,900) | 94,100 | (77,000) | 53,100 | 202,980 | (153,741) | (183,990)
Net income attributable to noncontrolling interests from continuing operations | (8,900) | (5,900) | (4,900) | (5,400) | (4,200) | (3,100) | (5,200) | (4,000) |  |  |
Net income attributable to noncontrolling interests from discontinued operations | 1,200 | 1,000 | 1,000 | 1,500 | (2,200) | (1,600) | (3,900) | (8,500) |  |  |
Net income attributable to noncontrolling interests | (10,100) | (6,900) | (5,900) | (6,900) | (6,400) | (4,700) | (9,100) | (12,500) | (29,795) | (32,629) | (77,060)
Net income (loss) attributable to AECOM from continuing operations | 95,100 | 27,900 | 88,300 | 83,400 | (100) | 91,100 | 48,500 | 30,900 | 294,684 | 170,452 | 210,962
Net income (loss) attributable to AECOM from discontinued operations | 1,100 | (16,400) | (48,900) | (57,300) | (230,200) | (1,700) | (134,600) | 9,700 | (121,499) | (356,822) | (472,012)
Net income (loss) attributable to AECOM | $ 96,200 | $ 11,500 | $ 39,400 | $ 26,100 | $ (230,300) | $ 89,400 | $ (86,100) | $ 40,600 | $ 173,185 | $ (186,370) | $ (261,050)
Net income attributable to AECOM per share: |  |  |  |  |  |  |  |  |  |  |
Basic continuing operations per share | $ 0.66 | $ 0.19 | $ 0.60 | $ 0.55 |  | $ 0.57 | $ 0.31 | $ 0.20 | $ 2.00 | $ 1.07 | $ 1.34
Basic discontinued operations per share | 0.01 | (0.11) | (0.33) | (0.38) | $ (1.44) | (0.01) | (0.85) | 0.06 | (0.82) | (2.24) | (3.00)
Basic earnings per share | 0.67 | 0.08 | 0.27 | 0.17 | (1.44) | 0.56 | (0.54) | 0.26 | 1.18 | (1.17) | (1.66)
Earnings Per Share, Diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |
Diluted continuing operations per share | 0.65 | 0.19 | 0.59 | 0.54 |  | 0.56 | 0.30 | 0.19 | 1.97 | 1.06 | 1.32
Diluted discontinued operations per share | 0.01 | (0.11) | (0.33) | (0.37) | (1.44) | (0.01) | (0.84) | 0.06 | (0.81) | (2.22) | (2.95)
Diluted earnings per share | $ 0.66 | $ 0.08 | $ 0.26 | $ 0.17 | $ (1.44) | $ 0.55 | $ (0.54) | $ 0.25 | $ 1.16 | $ (1.16) | $ (1.63)
Weighted average shares outstanding: |  |  |  |  |  |  |  |  |  |  |
Basic | 143,800 | 146,100 | 147,800 | 151,400 | 160,000 | 160,100 | 158,600 | 157,300 | 147,279 | 159,005 | 157,044
Diluted | 146,600 | 148,900 | 149,500 | 153,700 | 160,000 | 161,800 | 160,700 | 160,600 | 149,676 | 161,292 | 159,684

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