Maximus, Inc. Annual report pursuant to Section 13 and 15(d)

Business segments - Revenue from External Customers by Geographic Areas (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Revenues and total long-lived assets
Revenue	$ 558,446	$ 597,855	$ 612,787	$ 623,148	$ 620,903	$ 600,447	$ 622,047	$ 607,564	$ 2,392,236	$ 2,450,961	$ 2,403,360
United States
Revenues and total long-lived assets
Revenue									1,692,823	1,765,661	1,721,261
United Kingdom
Revenues and total long-lived assets
Revenue									347,026	346,342	384,649
Australia
Revenues and total long-lived assets
Revenue									247,850	232,434	200,539
Rest of World
Revenues and total long-lived assets
Revenue									$ 104,537	$ 106,524	$ 96,911