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Acquisitions (Narrative) (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 02, 2016 | Jan. 29, 2016 | Oct. 16, 2015 | Jan. 28, 2015 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 323,616 |  |  |  | $ 291,157 |  |  |  | $ 323,616 | $ 291,157 | $ 282,300
Revenue, Net |  |  |  |  | $ 159,505 | $ 140,191 | $ 138,930 | $ 132,833 | $ 153,612 | $ 134,191 | $ 128,941 | $ 120,547 | $ 571,459 | $ 537,291 | $ 531,120
Enoserv LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 10,000 |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  | 8,000 |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Total |  |  |  | 20,500 |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total |  |  |  | $ 9,000 |  |  |  |  |  |  |  |  |  |  |
Fremont Plastics, Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  | $ 10,500 |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings |  |  | $ 2,000 |  |  |  |  |  |  |  |  |  |  |  |
Plastique Group Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  | $ 31,600 |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | 10,200 |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability |  | 2,700 |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total |  | 11,900 |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Net |  | 35,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment, Total |  | $ 9,600 |  |  |  |  |  |  |  |  |  |  |  |  |
Westland Technologies, Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross | $ 41,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 17,900 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total | 28,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Net | 25,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment, Total | 5,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities | $ 10,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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