Business and summary of significant accounting policies - Fair Value Measurements (Details) |
12 Months Ended |
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Sep. 30, 2017
acquisition
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| Organization, Consolidation and Presentation of Financial Statements [Abstract] | |
| Number of businesses acquired with contingent payments | 2 |
| X | ||||||||||
- Definition Number of Businesses Acquired With Contingent Payments No definition available.
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| X | ||||||||||
- References No definition available.
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