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Receivables And Concentration Of Credit Risk (Narrative) (Details) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Dec. 29, 2019 USD ($) customer | Dec. 30, 2018 | Sep. 30, 2019 USD ($) | Sep. 30, 2018 customer
Receivables [Line Items] |  |  |  |
Allowance for uncollectible receivables | $ | $ 4.8 |  | $ 4.9 |
Major Customer Three [Member] | Net Sales And/Or Trade Receivables [Member] |  |  |  |
Receivables [Line Items] |  |  |  |
Number of major customers accounting for a significant percentage of sales and/or receivables volume | customer | 3 |  |  | 3
Major Customer Three [Member] | Net Sales And/Or Trade Receivables [Member] | Minimum [Member] |  |  |  |
Receivables [Line Items] |  |  |  |
Concentration risk | 10.00% |  |  | 10.00%
Major Customer Three [Member] | Sales Revenue, Goods, Net [Member] |  |  |  |
Receivables [Line Items] |  |  |  |
Concentration risk | 30.80% | 29.90% |  |
Major Customer Three [Member] | Trade Receivable [Member] |  |  |  |
Receivables [Line Items] |  |  |  |
Concentration risk | 39.30% |  | 29.90% |

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- Definition Amount of allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118955202&loc=SL82895884-210446 + Details
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