Restructuring - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Apr. 01, 2016	May. 01, 2015	Apr. 01, 2016	May. 01, 2015	Oct. 02, 2015
Restructuring And Related Activities [Abstract]
Restructuring expense	$ 1.9	$ 3.8	$ 3.3	$ 9.3
Accrued restructuring	$ 5.7		$ 5.7		$ 5.2

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 5.P.4(b))
-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 5
-Section P
-Subsection 3, 4

Name:	us-gaap_RestructuringReserve
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant