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Operations and summary of significant accounting policies (Schedule of finite-lived intangible assets useful lives) (Details)	12 Months Ended
	Sep. 30, 2015
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	4 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