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Business and summary of significant accounting policies - Narrative (Details) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Jul. 01, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Oct. 01, 2018
Property and Equipment |  |  |  |  |
Retained earnings |  | $ 794,739,000 | $ 633,281,000 |  | $ 666,210,000
Goodwill, impairment loss | $ 0 |  |  |  |
Impairment of long-lived assets held-for-use |  |  | $ 0 | $ 0 |
Accounting Standards Update 2014-09 |  |  |  |  |
Property and Equipment |  |  |  |  |
Retained earnings |  |  |  |  | $ 32,900,000
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 |  |  |
U.S. Health and Human Services |  |  |  |  |
Property and Equipment |  |  |  |  |
Impairment loss on contract costs |  | $ 3,700,000 |  |  |

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