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Business combinations and disposal - Narrative (Details) $ in Thousands, $ in Millions |  |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Aug. 16, 2019 CAD ($) | Aug. 16, 2019 USD ($) | Nov. 16, 2018 USD ($) | Jul. 18, 2017 USD ($) | May 31, 2017 USD ($) | Jun. 30, 2019 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 584,469 | $ 399,882 | $ 402,976
Amortization of intangible assets |  |  |  |  |  |  | 33,054 | 10,308 | 12,208
Gain on sale of a business |  |  |  |  |  |  | 0 | 0 | $ 650
General Dynamics Information Technology's Citizen Engagement Centers |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash payment to acquire business |  |  | $ 400,000 |  |  |  |  |  |
Estimated cash consideration |  |  | 430,700 |  |  | $ 430,699 | 430,723 |  |
Acquisition-related expenses |  |  |  |  |  |  | 2,700 | 500 |
Payments to acquire software licenses |  |  |  |  |  |  | 4,500 |  |
Goodwill |  |  |  |  |  | 184,614 | 184,640 |  |
Intangible assets acquired |  |  |  |  |  |  | 122,300 |  |
Revenue from acquiree since date of acquisition |  |  |  |  |  |  | 615,100 |  |
Gross profit from acquiree since date of acquisition |  |  |  |  |  |  | 117,400 |  |
Intangible assets |  |  |  |  |  | $ 122,300 | 122,300 |  |
General Dynamics Information Technology's Citizen Engagement Centers | Customer relationships - all contracts except U.S. Census |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets acquired |  |  |  |  |  |  | $ 85,300 |  |
Weighted average remaining life of assets not fully amortized |  |  |  |  |  |  | 10 years |  |
General Dynamics Information Technology's Citizen Engagement Centers | Customer relationships, U.S. decennial census |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Weighted average remaining life of assets not fully amortized |  |  |  |  |  |  | 7 years 7 months 6 days |  |
General Dynamics Information Technology's Citizen Engagement Centers | Customer relationship - U.S. Census |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets acquired |  |  |  |  |  |  | $ 37,000 |  |
Weighted average remaining life of assets not fully amortized |  |  |  |  |  |  | 2 years |  |
General Dynamics Information Technology's Citizen Engagement Centers | Customer relationship - U.S. Census | Pro Forma |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Amortization of intangible assets |  |  |  |  |  |  | $ 18,500 | $ 18,500 |
General Dynamics Information Technology's Citizen Engagement Centers | Line of Credit |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from long-term lines of credit |  |  | 150,000 |  |  |  |  |  |
GT Hiring Solutions |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash payment to acquire business | $ 8.1 | $ 6,100 |  |  |  |  |  |  |
Goodwill |  |  | 1,700 |  |  |  |  |  |
Share capital acquired (as a percent) | 100.00% | 100.00% |  |  |  |  |  |  |
Intangible assets |  |  | $ 2,700 |  |  |  |  |  |
Revitalised |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash payment to acquire business |  |  |  | $ 4,000 |  |  |  |  |
Goodwill |  |  |  | $ 2,800 |  |  |  |  |
Share capital acquired (as a percent) |  |  |  | 100.00% |  |  |  |  |
Intangible assets |  |  |  | $ 1,300 |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Related to Disposition of K-12 Education | K-12 Education |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Gain on sale of a business |  |  |  |  | $ 700 |  |  |  |
United Kingdom Subsidiary |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Purchase of non-controlling interest by parent |  |  |  |  |  |  | 400 |  |
Saudi Arabia Subsidiary |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Purchase of non-controlling interest by parent |  |  |  |  |  |  | $ 200 |  |

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