Fair Values Hierarchy for Financial Assets and Liabilities Measured on Recurring Basis (Detail) (USD $) In Millions, unless otherwise specified	Jan. 25, 2015	Apr. 27, 2014
Fair Value, Inputs, Level 1
Assets
Assets	$ 0	$ 7.5
Liabilities
Liabilities	8.1	0
Fair Value, Inputs, Level 1 \| Contingent consideration
Liabilities
Liabilities	0	0
Fair Value, Inputs, Level 1 \| Commodity and other contracts
Assets
Assets	0	7.5
Liabilities
Liabilities	8.1	0
Fair Value, Inputs, Level 1 \| Foreign exchange contracts
Assets
Assets	0	0
Fair Value, Inputs, Level 1 \| Interest rate contracts
Liabilities
Liabilities	0	0
Fair Value, Inputs, Level 2
Assets
Assets	0.7	1.9
Liabilities
Liabilities	30.3	35.2
Fair Value, Inputs, Level 2 \| Contingent consideration
Liabilities
Liabilities	0	0
Fair Value, Inputs, Level 2 \| Commodity and other contracts
Assets
Assets	0	1.9
Liabilities
Liabilities	13.6	0
Fair Value, Inputs, Level 2 \| Foreign exchange contracts
Assets
Assets	0.7	0
Fair Value, Inputs, Level 2 \| Interest rate contracts
Liabilities
Liabilities	16.7	35.2
Fair Value, Inputs, Level 3
Assets
Assets	0	0
Liabilities
Liabilities	2.2	3.1
Fair Value, Inputs, Level 3 \| Contingent consideration
Liabilities
Liabilities	2.2	3.1
Fair Value, Inputs, Level 3 \| Commodity and other contracts
Assets
Assets	0	0
Liabilities
Liabilities	0	0
Fair Value, Inputs, Level 3 \| Foreign exchange contracts
Assets
Assets	0	0
Fair Value, Inputs, Level 3 \| Interest rate contracts
Liabilities
Liabilities	$ 0	$ 0

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