Revenue from External Customers and Long-Lived Assets, by Geographical Areas (Detail) - USD ($) $ in Thousands		12 Months Ended
		Sep. 28, 2018	Sep. 29, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Segment Earnings	[1]	$ 260,395	$ 251,833	$ 237,502
Identifiable Assets	[2]	2,940,744	3,048,009	2,970,388
US
Segment Reporting Information [Line Items]
Segment Earnings	[1]	127,173	118,648	130,440
Identifiable Assets	[2]	979,917	1,049,747	1,055,021
Canada
Segment Reporting Information [Line Items]
Segment Earnings	[1]	37,014	26,521	8,659
Identifiable Assets	[2]	507,687	499,418	450,047
France
Segment Reporting Information [Line Items]
Segment Earnings	[1]	62,474	63,633	61,121
Identifiable Assets	[2]	752,856	753,854	770,593
United Kingdom
Segment Reporting Information [Line Items]
Segment Earnings	[1]	20,761	22,950	25,646
Identifiable Assets	[2]	379,292	405,423	394,811
All Other Foreign
Segment Reporting Information [Line Items]
Segment Earnings	[1]	12,973	20,081	11,636
Identifiable Assets	[2]	$ 320,992	$ 339,567	$ 299,916

[1] Before corporate expense, shown on page 80.

[2] Excludes corporate, shown on page 80.