Business and summary of significant accounting policies - Description of Business (Details) |
12 Months Ended |
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Sep. 30, 2017
segment
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| Organization, Consolidation and Presentation of Financial Statements [Abstract] | |
| Number of business segments | 3 |
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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. No definition available.
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- References No definition available.
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