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Critical accounting estimates and judgments - Narrative (Details) - cash_generating_unit	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Disclosure of information for cash-generating units [line items]
Number of cash-generating units		39	39
Argentina and Uruguay
Disclosure of information for cash-generating units [line items]
Number of cash-generating units		11	11
Brazil
Disclosure of information for cash-generating units [line items]
Number of cash-generating units	2	3

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- Definition

Number of Cash-Generating Units

+ References

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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- Details

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