Leases (Adoption of ASU 2016-02) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Oct. 01, 2019	Sep. 30, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets, net	$ 39,427	$ 42,073	$ 0
Operating lease liabilities	44,001
Accrued expenses and other liabilities	124,016	115,435	101,839
Obligation under operating leases	31,008	29,308	0
Prepaid and other current assets	20,051	21,867	21,940
Property, plant, and equipment, net	356,424	336,396	$ 333,584
Obligations under finance leases, excluding current installments	$ 25,852
Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets, net		42,073
Operating lease liabilities		42,904
Accrued expenses and other liabilities		13,596
Obligation under operating leases		29,308
Prepaid and other current assets		(73)
Property, plant, and equipment, net		2,812
Obligations under finance leases, excluding current installments		$ 3,245