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Operations and summary of significant accounting policies (Schedule of reclassifications) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortization of Intangible Assets | $ 6,449 | $ 6,439 | $ 6,431 | $ 6,458 | $ 6,727 | $ 6,887 | $ 6,926 | $ 6,946 | $ 25,777 | $ 27,486 | $ 29,241
Cost of Sales [Member] |  |  |  |  |  |  |  |  |  |  |
Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Prior Period Reclassification Adjustment | 1,955 | 1,948 | 1,943 | 1,954 | 1,961 | 2,117 | 2,162 | 2,180 | 7,800 | 8,420 | 9,115
Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |  |  |
Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Prior Period Reclassification Adjustment | $ 4,494 | $ 4,491 | $ 4,488 | $ 4,504 | $ 4,766 | $ 4,770 | $ 4,764 | $ 4,766 | $ 17,977 | $ 19,066 | $ 20,126

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition The amount of a reclassification adjustment made to prior period financial statement amounts. + References No definition available. + Details
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