Income Taxes - Summary of Effective Income Tax Expense Reconciliation (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Apr. 26, 2014	Apr. 27, 2013	Apr. 28, 2012
Income Tax Disclosure [Abstract]
Tax at U.S. statutory rate	$ 109,519	$ 112,391	$ 115,434
State tax provision, net of federal benefit	7,768	8,322	7,277
Effect of foreign taxes	461	(4,603)	(3,944)
Permanent differences	(4,843)	(3,439)	(702)
Other	(605)	(1,826)	(1,068)
Provision for income taxes	$ 112,300	$ 110,845	$ 116,997

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority noncontrolling interest income (loss), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, increase (decrease) in enacted tax rate, prior year income taxes, increase (decrease) in deferred tax asset valuation allowance, and other adjustments.

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Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement.

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