Derivatives - Gains and Losses on Derivative Instruments (Detail) (Net investment hedging [Member], Canadian dollar foreign exchange contract [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	May 01, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Amt of Gain (Loss) (net of tax) Recognized in OCI on Derivative (Effective Portion) and recorded in Other assets and Accrued Expenses at Fair Value	$ (103)
Other Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	5
Amount of Gain (loss) (net of tax) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)	$ 79