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Restructuring - Additional Information (Detail) (USD $)
 6 Months Ended 12 Months Ended
May 01, 2015
May 02, 2014
Oct. 31, 2014
Dec. 05, 2013
Oct. 25, 2013
Restructuring And Related Activities [Abstract]          
Total expected integration cost       $ 35,000,000us-gaap_RestructuringAndRelatedCostExpectedCost1  
Restructuring expense 7,300,000us-gaap_RestructuringCosts 8,900,000us-gaap_RestructuringCosts 20,400,000us-gaap_RestructuringCosts    
Accrued restructuring $ 2,728,000us-gaap_RestructuringReserve   $ 5,915,000us-gaap_RestructuringReserve   $ 0us-gaap_RestructuringReserve