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Stock-Based Compensation - Valuation Assumptions for Stock Options (Detail) | 9 Months Ended | 3 Months Ended | 9 Months Ended | 6 Months Ended | 3 Months Ended
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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%

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- Definition 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. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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 + Details
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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 + Details
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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 + Details
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