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Pension and Other Postretirement Benefit Plans - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 25, 2014	Jan. 26, 2013	Jan. 25, 2014	Jan. 26, 2013
Pension and Other Postretirement Benefit Plans [Line Items]
Pension expense	$ 582	$ 751	$ 1,913	$ 2,338
Company contributions, employee benefit expenses	3,848	3,848	12,384	12,055
Company contributions for postretirement plan	$ 38	$ 38	$ 113	$ 113

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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