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Business Acquisition (Narrative) (Details) € in Thousands, $ in Thousands		3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 01, 2018 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2018 EUR (€)	Sep. 30, 2018 USD ($)
Business Acquisition [Line Items]
Borrowings on revolving lines of credit				$ 865,617	$ 809,680
Amortization of intangible assets		$ 16,693	$ 6,258	34,165	12,501
Net sales		758,844	548,249	1,411,655	1,018,397
Earnings before income taxes		90,168	$ 48,647	151,683	$ 86,134
Acquisition financing related costs		3,698		$ 7,497
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
Proceeds from issuance of long-term debt						$ 400,000
Borrowings on revolving lines of credit						$ 167,420
Amortization of intangible assets		10,885		$ 22,578
Goodwill, Acquired During Period	$ 257,447
Net sales		87,986		175,666
Earnings before income taxes		$ 11,898		$ 22,500
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