Accrued Liabilities (Detail) - USD ($) $ in Thousands	Sep. 29, 2017	Sep. 30, 2016	Oct. 02, 2015
Accrued Liabilities Current [Abstract]
Payroll and other compensation	$ 120,428	$ 107,132
Commissions	4,442	5,901
Casualty and medical	16,067	14,933
Interest	6,592	6,397
Warranties	14,689	13,365	$ 14,658
State and other tax accruals	5,222	4,737
Customer deposits	20,593	22,302
Deferred revenue	18,269	26,618
Contract reserves	5,109	8,822
Forward foreign exchange contracts	4,387	12,036
Litigation reserves	1,454	4,006
Environmental reserves	645	646
Deferred rent	1,645	1,925
Other	10,068	9,343
Total accrued liabilities	$ 229,610	$ 238,163