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Operations and summary of significant accounting policies (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended | 24 Months Ended | 36 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2016 | Sep. 30, 2016
Depreciation expense |  | $ 41,550 | $ 45,994 | $ 43,773 |  |
Selling, general, and administrative expenses include net foreign currency transaction gains (losses) |  | 701 | $ (1,721) | (1,089) |  |
Goodwill, Impairment Loss |  |  |  |  |  | $ 0
Asset Impairment Charges | $ 3,138 |  |  | $ 3,138 | $ 0 |
Service Life [Member] |  |  |  |  |  |
Depreciation expense |  | $ (12,000) |  |  |  |

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- Definition Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64836518&loc=d3e30700-110894 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=64836518&loc=d3e30690-110894 + Details
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