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Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Jan. 26, 2013
Income Taxes [Line Items]
Unrecognized tax benefits, all of which, if recognized, would affect effective tax rate	$ 17,169
Accrued interest and penalties included in unrecognized tax benefits	3,874
Unrecognized tax benefits	$ 17,169
Tax year subject to examination	2007

This element represents the total of accruals as of the date of the statement of financial position for interest recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties for a tax position claimed or expected to be claimed by the entity, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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