Stock-Based Compensation - Valuation Assumptions for Stock Options (Detail)	9 Months Ended	3 Months Ended	9 Months Ended	6 Months Ended	3 Months Ended
Sep. 26, 2014 Employee Stock Purchase Plan [Member]	Sep. 26, 2014 Stock Options [Member]	Sep. 27, 2013 Stock Options [Member]	Sep. 26, 2014 Stock Options [Member]	Sep. 27, 2013 Stock Options [Member]	Jun. 30, 2013 Purchase Period June 30, 2013 [Member] Employee Stock Purchase Plan [Member]	Jun. 30, 2014 Purchase Period June 30, 2014 [Member] Employee Stock Purchase Plan [Member]	Sep. 26, 2014 Purchase Period December 31, 2014 [Member] Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (years)		4 years 8 months 13 days	4 years 8 months 13 days	4 years 8 months 13 days	4 years 8 months 13 days	5 months 27 days	6 months	6 months
Volatility		40.00%	46.00%	40.00%	51.00%	30.00%	28.00%	33.00%
Risk-free interest rate		1.80%	1.50%	1.70%	0.80%	0.20%	0.10%	0.10%
Expected dividends	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (f)(2)(iii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 14.D.2)

-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (f)(2)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section D

-Subsection 2

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (f)(2)(iv)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Weighted average expected volatility rate of share-based compensation awards.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (f)(2)(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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