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Statutory Reserves (Detail) (Subsidiaries [Member], China [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended
Jul. 28, 2013
Subsidiaries [Member] | China [Member]
 
Statutory Reserve [Line Items]  
Percentage of net income required to be transferred to a statutory surplus reserve fund 10.00%
Maximum required percentage of statutory surplus reserve fund to registered capital 50.00%
Statutory surplus reserve fund balance $ 4.1
Percentage of accumulated earnings and profits determined in accordance with PRC accounting rules and regulations 10.00%
Minimum threshold percentage for statutory surplus reserve fund as percentage of registered capital, below which certain capital transactions are prohibited 25.00%