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Benefit Plans - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended
Dec. 29, 2013
Sep. 28, 2014
Apr. 30, 2014
Sep. 28, 2014
Rehabilitation Plan [Member]
Sep. 28, 2014
401(k) Savings Plan [Member]
Sep. 29, 2013
401(k) Savings Plan [Member]
Dec. 29, 2013
401(k) Savings Plan [Member]
Sep. 28, 2014
Minimum [Member]
Sep. 28, 2014
Maximum [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]                  
Non-cash charge due to lump sum distribution $ 12.0                
Benefit pension plan, anticipated contribution remainder of year               1 3
Entity contribution in its owned sponsored pension plan during the period   7.5              
Company matching contribution percentage         3.50%   5.00%    
Defined contribution plan matching contribution percentage accrued         1.50%   5.00%    
Defined contribution percentage portion of participants contribution first matched by Company         3.50%        
Defined contribution plan contribution amount         5.1        
Defined contribution percentage portion of additional contribution increased as per option of Company         1.50%   5.00%    
Defined contribution plan cost recognized         6.2 5.8      
Multi-employer pension plan exit charge, liability recorded   9.0              
Multi-employer pension plan exit annual payment amount   1              
Multi-employer pension plan Rehabilitation Plan adoption effective date       Jan. 01, 2015          
Collective bargaining agreement, effective date       Apr. 28, 2014          
Likely withdrawal liability if Company withdraws from multi-employer pension plan     $ 4.5