Leases (Adoption of ASU 2016-02) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Oct. 01, 2019	Sep. 30, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Right-of-Use Asset	$ 45,965	$ 42,073
Operating lease liabilities	50,563
Accrued expenses and other liabilities	143,389	115,435	$ 101,839
Obligations under operating leases, excluding current installments	37,796	29,308
Prepaid and other current assets	(18,715)	(21,867)
Property, plant, and equipment, net	364,461	336,396	$ 333,584
Obligations under finance leases, excluding current installments	$ 26,270
Accounting Standards Update [Extensible List]	us:gaap_AccountingStandardsUpdate201602Member
Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Right-of-Use Asset		42,073
Operating lease liabilities		42,904
Accrued expenses and other liabilities		13,596
Obligations under operating leases, excluding current installments		29,308
Prepaid and other current assets		73
Property, plant, and equipment, net		2,812
Obligations under finance leases, excluding current installments		$ 3,245