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Valuation And Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Oct. 03, 2015
Contract Loss Reserve      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of year $ 32,543 $ 30,422 $ 35,984
Additions charged to cost and expenses 40,774 29,469 24,073
Deductions 30,134 27,152 29,120
Foreign exchange impact and other 31 (196) (515)
Balance at end of year 43,214 32,543 30,422
Allowance for Doubtful Accounts      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of year 4,538 5,286 4,341
Additions charged to cost and expenses 1,291 1,594 2,889
Deductions 1,786 2,095 1,624
Foreign exchange impact and other 308 (247) (320)
Balance at end of year 4,351 4,538 5,286
Inventory Valuation Reserve      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of year 109,192 103,350 102,572
Additions charged to cost and expenses 12,661 24,183 21,166
Deductions 14,019 17,622 17,911
Foreign exchange impact and other 705 (719) (2,477)
Balance at end of year 108,539 109,192 103,350
Valuation Allowance of Deferred Tax Assets      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of year 10,938 9,583 9,216
Additions charged to cost and expenses 895 2,981 1,313
Deductions 7,172 1,521 281
Foreign exchange impact and other 115 (105) (665)
Balance at end of year $ 4,776 $ 10,938 $ 9,583