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Acquisitions (Narrative) (Details) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 28, 2015 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Sep. 30, 2013 USD ($) a
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 291,157 | $ 282,337 | $ 282,900
Payments to Acquire Productive Assets, Total |  | $ 12,444 | $ 12,714 | 13,862
Canyon Engineering Products Inc [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Payments to Acquire Businesses, Gross |  |  |  | 9,200
Payments to Acquire Manufacturing Facility |  |  |  | 7,000
Goodwill |  |  |  | $ 1,300
Area of Real Estate Property | a |  |  |  | 70,000
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 |  |  |
Customer Relationships [Member] | Canyon Engineering Products Inc [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Amortizable identifiable intangible assets |  |  |  | $ 1,700
Felix Tool And Engineering Inc [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Payments to Acquire Productive Assets, Total |  |  |  | 1,200
Finepoint Marketing Inc [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill |  |  |  | 1,300
Payments to Acquire Productive Assets, Total |  |  |  | 2,500
Finepoint Marketing Inc [Member] | Customer Relationships [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Amortizable identifiable intangible assets |  |  |  | $ 1,200

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