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Trade Accounts Receivable Sale Programs - Narrative (Details) - USD ($)
12 Months Ended
Oct. 19, 2017
Mar. 17, 2017
Sep. 30, 2017
Oct. 01, 2016
Oct. 03, 2015
Amount Received From Trade Accounts Receivable Sold To Third Party [Line Items]          
Trade accounts receivable sold     $ 418,000,000 $ 65,600,000 $ 93,100,000
Cash proceeds     415,800,000 $ 65,000,000 $ 92,400,000
BTMU RPA          
Amount Received From Trade Accounts Receivable Sold To Third Party [Line Items]          
Maximum facility amount     $ 120,000,000.0    
Minimum prior notice required to cancel automatic extension     10 days    
BTMU RPA | Subsequent Event          
Amount Received From Trade Accounts Receivable Sold To Third Party [Line Items]          
Maximum facility amount $ 160,000,000.0        
HSBC RPA          
Amount Received From Trade Accounts Receivable Sold To Third Party [Line Items]          
Maximum facility amount   $ 60,000,000