Fair Value of Long Term Debt (Detail) - USD ($) $ in Millions	Sep. 27, 2015	Dec. 28, 2014
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Revolving credit facility borrowings	$ 200.0	$ 200.0
Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Revolving credit facility borrowings	$ 200.0	$ 200.0

Fair value portion of contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Line-of-Credit Arrangement

-URI http://asc.fasb.org/extlink&oid=6517033

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