Maximus, Inc. Quarterly report pursuant to Section 13 or 15(d)

Quarterly report pursuant to Section 13 or 15(d)

Business combinations - Narrative (Details)

Business combinations - Narrative (Details) $ in Thousands, $ in Millions, ₩ in Billions									1 Months Ended	3 Months Ended		9 Months Ended
	Jun. 30, 2021 USD ($)	May 28, 2021 USD ($)	Mar. 31, 2021 USD ($)	Mar. 01, 2021 USD ($)	Aug. 21, 2020 USD ($)	Aug. 21, 2020 KRW (₩)	Feb. 28, 2020 USD ($)	Feb. 28, 2020 AUD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Sep. 30, 2020 USD ($)	Aug. 21, 2020 KRW (₩)	Feb. 28, 2020 AUD ($)
Business Acquisition [Line Items]
Amortization of intangible assets										$ 12,132	$ 8,712	$ 23,718	$ 26,734
Revenue										1,243,520	901,337	3,148,354	2,537,701
Gross profit										291,856	$ 185,603	728,569	$ 514,151
Acquisition-related expenses												8,800
Goodwill	$ 1,757,795								$ 1,757,795	1,757,795		$ 1,757,795		$ 593,129
Weighted Average
Business Acquisition [Line Items]
Estimated Straight-Line Useful Life												11 years 2 months 12 days
Weighted Average \| Customer contracts and relationships
Business Acquisition [Line Items]
Estimated Straight-Line Useful Life				11 years 2 months 12 days
Weighted Average \| Technology-based intangible assets
Business Acquisition [Line Items]
Estimated Straight-Line Useful Life												13 years 8 months 12 days
Weighted Average \| Provider network
Business Acquisition [Line Items]
Estimated Straight-Line Useful Life												11 years 10 months 24 days
VES Group, Inc.
Business Acquisition [Line Items]
Percentage of voting equity interests acquired		100.00%
Estimated cash consideration, net of cash acquired		$ 1,367,725
Liabilities arising from contingencies		12,000
Indemnification assets		6,000
Indemnification assets, range of outcomes, value, low		6,000
Indemnification assets, range of outcomes, value, high		12,000
Liability for uncertainty in income taxes		11,800
Revenue contributed from acquired business									45,800
Gross profit contributed from acquired business									19,500
Amortization of intangible assets									4,600
Acquisition-related expenses												$ 52,200
Goodwill		857,274
Intangible assets		664,000
VES Group, Inc. \| Indemnification Asset On Uncertain Tax Positions
Business Acquisition [Line Items]
Indemnification assets		$ 6,700
VES Group, Inc. \| Customer contracts and relationships
Business Acquisition [Line Items]
Estimated Straight-Line Useful Life		12 years
VES Group, Inc. \| Technology-based intangible assets
Business Acquisition [Line Items]
Estimated Straight-Line Useful Life		14 years
Attain
Business Acquisition [Line Items]
Estimated cash consideration, net of cash acquired	419,097		$ 419,864	$ 419,100
Revenue										56,400		74,800
Gross profit										13,200		17,100
Acquisition-related expenses												300
Goodwill	304,026		303,465						304,026	304,026		304,026
Intangible assets	$ 105,000		$ 105,000						$ 105,000	105,000		$ 105,000
Attain \| Customer Relationships
Business Acquisition [Line Items]
Estimated Straight-Line Useful Life				10 years
InjuryNet
Business Acquisition [Line Items]
Percentage of voting equity interests acquired							100.00%									100.00%
Cash payment to acquire business							$ 4,400	$ 6.7
Contingent consideration							2,100									$ 3.1
Goodwill							2,600
Intangible assets							$ 900
Index Root
Business Acquisition [Line Items]
Percentage of voting equity interests acquired					100.00%										100.00%
Cash payment to acquire business					$ 5,400	₩ 6.3
Contingent consideration					900										₩ 1.1
Goodwill					4,600
Intangible assets					$ 1,400
Reversal of acquisition related costs										$ 1,000