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Basis Of Presentation Basis of Presentation (Cumulative effect from adoption of ASC 606) (Details) - USD ($)
$ in Thousands
Dec. 29, 2018
Sep. 30, 2018
Sep. 29, 2018
New Accounting Pronouncements or Change in Accounting Principle      
Receivables $ 867,415 $ 883,032 $ 793,911
Inventories 467,811 446,531 512,522
Deferred income taxes 15,902 17,462 17,328
Contract advances 183,855 152,608 151,687
Contract and contract-related loss reserves 42,683 44,688 42,258
Other accrued liabilities 119,622 122,083 120,944
Deferred income taxes 49,333 50,328 46,477
Retained earnings $ 2,023,803 1,988,437 $ 1,973,514
ASC 606      
New Accounting Pronouncements or Change in Accounting Principle      
Receivables   89,121  
Inventories   (65,991)  
Deferred income taxes   134  
Contract advances   921  
Contract and contract-related loss reserves   2,430  
Other accrued liabilities   1,139  
Deferred income taxes   3,851  
Retained earnings   $ 14,923