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Operations and summary of significant accounting policies (Schedule of finite-lived intangible assets useful lives) (Details) | 12 Months Ended
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Sep. 30, 2014
Minimum [Member] | Customer Relationships [Member] |
Finite-Lived Intangible Asset, Useful Life | 9 years
Minimum [Member] | Intellectual Property [Member] |
Finite-Lived Intangible Asset, Useful Life | 10 years
Minimum [Member] | Process Technology [Member] |
Finite-Lived Intangible Asset, Useful Life | 8 years
Minimum [Member] | Other Intangibles [Member] |
Finite-Lived Intangible Asset, Useful Life | 3 years
Maximum [Member] | Customer Relationships [Member] |
Finite-Lived Intangible Asset, Useful Life | 30 years
Maximum [Member] | Intellectual Property [Member] |
Finite-Lived Intangible Asset, Useful Life | 17 years
Maximum [Member] | Process Technology [Member] |
Finite-Lived Intangible Asset, Useful Life | 30 years
Maximum [Member] | Other Intangibles [Member] |
Finite-Lived Intangible Asset, Useful Life | 15 years

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration