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Business Acquisitions (Narrative) (Details) € in Thousands, $ in Thousands	3 Months Ended			12 Months Ended
	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2018 EUR (€)	Sep. 30, 2018 USD ($)	Jun. 01, 2018 USD ($)
Business Acquisition [Line Items]
Total purchase price				$ 771,115
Proceeds from issuance of long-term debt				400,000		$ 179,308
Borrowings on revolving lines of credit				1,930,261	$ 1,506,000	695,000
Amortization of Intangible Assets				44,742	25,777	27,486
Goodwill, Acquired During Period				257,447
Cost of forward option				5,543	0	0
Interest Expense				$ 31,770	27,430	$ 26,776
Business Acquisition, Acquiree - L'Orange [Member]
Business Acquisition [Line Items]
Effective Date of Acquisition				Jun. 01, 2018
Purchase agreement contract price							€ 700,000	$ 811,000
Total purchase price				$ 771,115
Cash paid at closing				780,401
Proceeds from issuance of long-term debt				400,000
Borrowings on revolving lines of credit				167,420
Amortization of Intangible Assets				19,753
Goodwill, Acquired During Period				257,447
Net sales since acquisition date	$ 78,027	$ 24,878		102,905
Net loss since acquisition date				9,334
Transaction costs	$ 850	3,077	$ 1,281	12,886
Cost of forward option		$ 5,543		5,543
Interest Expense				4,904
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual				9,334
Defined Benefit Pension Plan [Member]
Business Acquisition [Line Items]
Pension obligation assumed in L'Orange aquisition				39,257
Current portion of pension obligation					3			1,322
Defined Benefit Pension Plan [Member] | Business Acquisition, Acquiree - L'Orange [Member]
Business Acquisition [Line Items]
Pension obligation assumed in L'Orange aquisition				$ 39,257
Current portion of pension obligation									$ 1,143
Other Postretirement Benefit Plans [Member]
Business Acquisition [Line Items]
Current portion of pension obligation					$ 2,410			$ 2,249

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