New Accounting Standards (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Oct. 01, 2019	Sep. 30, 2019	Oct. 01, 2018
Bad debt expense for trade accounts receivable	$ 884
Allowance for uncollectible accounts receivable	6,889		$ 7,908
Operating right-of-use assets	18,918
Operating lease liabilities	19,494
ASU 2016-16 [Member] | Retained Earnings And Other Current Assets [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Cumulative effect from adoption				$ 1,005
ASC 842 [Member]
Cumulative effect from adoption	$ 255
Operating right-of-use assets		$ 18,894
Operating lease liabilities		$ 18,851
Operating lease liability statement of financial position extensible list		us-gaap:OtherLiabilitiesMember