Basis Of Presentation Basis of Presentation (Cumulative effect from adoption of ASC 606) (Details) - USD ($) $ in Thousands	Mar. 30, 2019	Sep. 30, 2018	Sep. 29, 2018
New Accounting Pronouncements or Change in Accounting Principle
Receivables	$ 898,801	$ 883,032	$ 793,911
Inventories	489,067	446,531	512,522
Deferred income taxes	15,671	17,462	17,328
Contract advances	169,836	152,608	151,687
Contract and contract-related loss reserves	49,383	44,688	42,258
Other accrued liabilities	117,094	122,083	120,944
Deferred income taxes	53,272	50,328	46,477
Retained earnings	$ 2,057,435	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