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v3.19.1

Revenue Recognition Narrative (Details) | 6 Months Ended
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Mar. 31, 2019
Revenue from Contract with Customer [Abstract] |
Percentage of revenue recognized over time | 5.00%
Percentage of revenue from multiple deliverable arrangements | 5.00%
Percentage of product warranty expenses on sales | 1.00%

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- Definition Percentage Of Revenue From Multiple Deliverable Arrangements + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Product warranty expense as a percentage of sales. + References No definition available. + Details
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Namespace Prefix: | emr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of revenue recognized over time + References No definition available. + Details
Name: | emr_Percentageofrevenuerecognizedovertime
Namespace Prefix: | emr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration