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Recently Issued Accounting Standards - Additional Information (Detail) (Accounting Standards Update Twenty Fifteen Zero Three [Member], Other Long-term Assets and Long-term Debt [Member], USD $) In Millions, unless otherwise specified	Apr. 25, 2015
Accounting Standards Update Twenty Fifteen Zero Three [Member] \| Other Long-term Assets and Long-term Debt [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Decrease in assets and liabilities for fiscal 2016	$ 9.9

Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented.

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