Revenue from External Customers Attributed to Foreign Countries by Geographic Area (Detail) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Sep. 28, 2018	Jun. 29, 2018	Mar. 30, 2018	Dec. 29, 2017	Sep. 29, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 30, 2016	Sep. 28, 2018		Sep. 29, 2017		Sep. 30, 2016
Segment Reporting Information [Line Items]
Sales		$ 535,294	$ 499,871	$ 517,629	$ 482,045	$ 528,650	$ 504,107	$ 509,131	$ 458,416	$ 2,034,839	[1]	$ 2,000,304	[1]	$ 1,993,453	[1]
US
Segment Reporting Information [Line Items]
Sales	[1]									1,036,970		1,079,628		1,087,620
Canada
Segment Reporting Information [Line Items]
Sales	[1]									194,635		190,227		187,210
France
Segment Reporting Information [Line Items]
Sales	[1]									519,697		470,465		450,370
United Kingdom
Segment Reporting Information [Line Items]
Sales	[1]									250,694		237,794		262,234
All Other Foreign
Segment Reporting Information [Line Items]
Sales	[1]									362,313		352,962		330,995
Intersegment Elimination
Segment Reporting Information [Line Items]
Sales	[1]									(329,470)		(330,772)		(324,976)
Unaffiliated customers - U.S. | US
Segment Reporting Information [Line Items]
Sales	[1]									813,732		824,796		837,939
Unaffiliated customers - Export | US
Segment Reporting Information [Line Items]
Sales	[1]									187,695		199,494		172,209
Intercompany | US
Segment Reporting Information [Line Items]
Sales	[1]									35,543		55,338		77,472
Intercompany | Canada
Segment Reporting Information [Line Items]
Sales	[1]									6,063		8,449		3,378
Intercompany | France
Segment Reporting Information [Line Items]
Sales	[1]									70,988		56,824		51,461
Intercompany | United Kingdom
Segment Reporting Information [Line Items]
Sales	[1]									29,127		24,969		25,100
Intercompany | All Other Foreign
Segment Reporting Information [Line Items]
Sales	[1]									187,749		185,192		167,565
Unaffiliated Customers | Canada
Segment Reporting Information [Line Items]
Sales	[1]									188,572		181,778		183,832
Unaffiliated Customers | France
Segment Reporting Information [Line Items]
Sales	[1]									448,709		413,641		398,909
Unaffiliated Customers | United Kingdom
Segment Reporting Information [Line Items]
Sales	[1]									221,567		212,825		237,134
Unaffiliated Customers | All Other Foreign
Segment Reporting Information [Line Items]
Sales	[1]									$ 174,564		$ 167,770		$ 163,430

[1] Based on country from which the sale originated and the sale was recorded.