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Business and summary of significant accounting policies - Cash, Goodwill and Long-lived Assets (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Jul. 01, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Property and Equipment |  |  |  |
Goodwill, impairment loss | $ 0 | $ 0 |  |
Restricted cash |  | 7,300,000 | $ 13,500,000 |
Impairment of long-lived assets held-for-use |  | $ 0 | $ 0 | $ 0
Buildings | Maximum |  |  |  |
Property and Equipment |  |  |  |
Estimated useful lives |  | 39 years |  |
Office furniture and equipment. | Maximum |  |  |  |
Property and Equipment |  |  |  |
Estimated useful lives |  | 7 years |  |
Software development costs. | Minimum |  |  |  |
Property and Equipment |  |  |  |
Estimated useful lives |  | 3 years |  |
Software development costs. | Maximum |  |  |  |
Property and Equipment |  |  |  |
Estimated useful lives |  | 8 years |  |

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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13777-109266 + Details
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