Performance Contingent Total Shareholder Return Shares (Detail) (Total Shareholders Return)	12 Months Ended
	Dec. 29, 2012
90th Percentile
Schedule of Share based Compensation Arrangements by Share based Payment Award, Equity Instruments, Other Than Options, Restricted Stock Units [Line Items]
Percentile	90.00%
Payout as % of Target	200.00%
70th Percentile
Schedule of Share based Compensation Arrangements by Share based Payment Award, Equity Instruments, Other Than Options, Restricted Stock Units [Line Items]
Percentile	70.00%
Payout as % of Target	150.00%
50th Percentile
Schedule of Share based Compensation Arrangements by Share based Payment Award, Equity Instruments, Other Than Options, Restricted Stock Units [Line Items]
Percentile	50.00%
Payout as % of Target	100.00%
30th Percentile
Schedule of Share based Compensation Arrangements by Share based Payment Award, Equity Instruments, Other Than Options, Restricted Stock Units [Line Items]
Percentile	30.00%
Payout as % of Target	50.00%
Below 30th Percentile
Schedule of Share based Compensation Arrangements by Share based Payment Award, Equity Instruments, Other Than Options, Restricted Stock Units [Line Items]
Percentile	30.00%
Payout as % of Target	0.00%