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Payout Percentage of Total Shareholder Return Shares (Detail) - Total Shareholders Return
12 Months Ended
Dec. 30, 2017
2013 award | Fiscal 2015  
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award Equity Instruments Other Than Options Restricted Stock Units [Line Items]  
Payout percentage 88.00%
2014 Award | Fiscal 2016  
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award Equity Instruments Other Than Options Restricted Stock Units [Line Items]  
Payout percentage 27.00%
2015 Award | Fiscal 2017  
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award Equity Instruments Other Than Options Restricted Stock Units [Line Items]  
Payout percentage 0.00%