Income Taxes - Components of Deferred Tax Assets (Liabilities) (Detail) (USD $) In Thousands, unless otherwise specified	Apr. 26, 2014	Apr. 27, 2013
Income Tax Disclosure [Abstract]
Capital accumulation plan	$ 5,893	$ 5,540
Inventory related items	5,512	8,170
Bad debt allowance	1,518	2,092
LIFO reserve	(16,279)	(15,901)
Other	13,447	17,075
Deferred net current income tax asset	10,091	16,976
Amortizable intangibles	(26,590)	(27,934)
Goodwill	(69,613)	(62,911)
Property, plant, equipment	(4,744)	(5,390)
Stock based compensation expense	8,130	9,603
Net operating loss carryforwards	6,848	8,070
Other	(4,276)	(10,290)
Deferred long-term income tax (liability) asset	(90,245)	(88,852)
Valuation allowance	(3,759)	(4,477)
Deferred net long-term income tax liability	(94,004)	(93,329)
Net deferred income tax liability	$ (83,913)	$ (76,353)

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from inventory.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed within one year or operating cycle, if longer.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences not separately disclosed.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from the allowance for doubtful accounts.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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Amount of deferred tax liability attributable to taxable temporary differences from intangible assets other than goodwill.

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Amount of deferred tax liability attributable to taxable temporary differences, net of deferred tax asset attributable to deductible temporary differences and carryforwards net of valuation allowances expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment.

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