Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

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

Contingencies - Narrative (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended		9 Months Ended
	Oct. 10, 2012 Y	Sep. 29, 2012	Sep. 29, 2012 Prime and Federal Fund Rate [Member]	Sep. 29, 2012 London Interbank Offered Rate (LIBOR) [Member]
Loss Contingencies [Line Items]
Revolving credit agreement in years	5
Revolving credit agreement in years	$ 250
Spread on Federal funds effective rate			0.50%
Ratio of total debt to EBITDA			Ranges from 0.25% to 1.75%	Ranges from 1.00% to 1.75%
Spread in effect at closing for LIBOR-based loans			0.00%	1.00%
credit agreement		$ 100