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Acquisition of Citizen Engagement Centers Business - Pro Forma Results (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018
Business Combinations [Abstract] |  |  |  |
Revenue | $ 736,520 | $ 770,590 | $ 1,499,568 | $ 1,592,723
Net income | $ 61,766 | $ 56,803 | $ 120,962 | $ 119,991
Basic earnings per share attributable to MAXIMUS (in dollars per share) | $ 0.96 | $ 0.87 | $ 1.88 | $ 1.81
Diluted earnings per share attributed to MAXIMUS (in dollars per share) | $ 0.96 | $ 0.86 | $ 1.87 | $ 1.80

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