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Goodwill - Schedule of goodwill (Details) - USD ($) | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Goodwill [Roll Forward] |  |  |
Balance at the beginning of the period | $ 593,129,000 | $ 584,469,000 |
Acquisitions | 1,179,943,000 | 7,652,000 |
Disposal of Q2 Administrators, LLC |  | (899,000) |
Foreign currency translation | 1,334,000 | 1,907,000 |
Balance at the end of the period | 1,774,406,000 | 593,129,000 | $ 584,469,000
Goodwill, impairment loss | 0 | 0 | 0
U.S. Services |  |  |
Goodwill [Roll Forward] |  |  |
Balance at the beginning of the period | 164,472,000 | 164,472,000 |
Acquisitions | 0 | 0 |
Disposal of Q2 Administrators, LLC |  | 0 |
Foreign currency translation | 0 | 0 |
Balance at the end of the period | 164,472,000 | 164,472,000 | 164,472,000
U.S. Federal Services |  |  |
Goodwill [Roll Forward] |  |  |
Balance at the beginning of the period | 381,719,000 | 382,618,000 |
Acquisitions | 1,168,202,000 | 0 |
Disposal of Q2 Administrators, LLC |  | (899,000) |
Foreign currency translation | 0 | 0 |
Balance at the end of the period | 1,549,921,000 | 381,719,000 | 382,618,000
Outside the U.S. |  |  |
Goodwill [Roll Forward] |  |  |
Balance at the beginning of the period | 46,938,000 | 37,379,000 |
Acquisitions | 11,741,000 | 7,652,000 |
Disposal of Q2 Administrators, LLC |  | 0 |
Foreign currency translation | 1,334,000 | 1,907,000 |
Balance at the end of the period | $ 60,013,000 | $ 46,938,000 | $ 37,379,000

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
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