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