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Acquisition of Citizen Engagement Centers Business - Pro Forma Results (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Business Combinations [Abstract] |  |
Revenue | $ 763,048 | $ 822,132
Net income | $ 59,196 | $ 63,293
Basic earnings per share attributable to MAXIMUS (in dollars per share) | $ 0.92 | $ 0.95
Diluted earnings per share attributed to MAXIMUS (in dollars per share) | $ 0.91 | $ 0.94

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