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Employees' Retirement and Defined Contribution Plans - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 27, 2013	Apr. 28, 2012	Apr. 30, 2011
Pension and Other Postretirement Benefit Plans [Line Items]
Pension expense	$ 2,836	$ 1,970	$ 2,558
Company contributions, employee benefit expenses	15,902	15,273	14,212
Company contributions for postretirement plan	$ 0	$ 150	$ 150

The amount of pension benefit costs recognized during the period for (1) defined benefit plans and (2) defined contribution plans. For defined benefit plans, pension expense includes the following components: service cost, interest cost, expected return on plan assets, gain (loss) on plan assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. For defined contribution plans, the pension expense generally equals the firm's contribution to employees' accounts (if the firm contributes) during the period.

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