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Shareholders' equity Assumptions Used to Estimate Fair Value of Option Awards (Detail)	12 Months Ended
	Dec. 29, 2013	Dec. 30, 2012	Dec. 25, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	61.94%
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average expected term (in years)	3 years	3 years
Risk free interest rate	0.36%	0.41%	0.00%
Expected dividend yield	4.44%	2.39%	0.00%
Expected volatility	40.80%	69.47%	0.00%
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average expected term (in years)	4 years 6 months	4 years 6 months	4 years 6 months
Expected volatility, minimum		65.74%	62.46%
Expected volatility, maximum		66.95%	64.39%
Weighted average volatility	61.94%	66.56%	62.54%
Risk free interest rate	0.75%	0.84%
Risk-free interest rates, minimum			0.87%
Risk-free interest rates, maximum			2.21%
Expected dividend yield	3.00%	5.00%
Expected dividend yield, minimum			1.00%
Expected dividend yield, maximum			2.00%
Weighted average expected dividend	3.00%	5.00%	1.06%

X

- Definition

Share Based Compensation Arrangement by Share Based Payment Award, Fair Value Assumptions, Expected Dividend Rate, Maximum

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Share Based Compensation Arrangement by Share Based Payment Award, Fair Value Assumptions, Expected Dividend Rate Minimum

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Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weighted Average Expected Dividend Rate

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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

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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



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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



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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section D

-Subsection 2

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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- Definition

The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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- Definition

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

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-Name Accounting Standards Codification

-Topic 718

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

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

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

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