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Accounting Policies (Details Textual) $ in Millions | 12 Months Ended |
--- | --- | ---
Apr. 30, 2015 USD ($) Facility Contract ReportingUnits | Apr. 30, 2014 USD ($) | Apr. 30, 2013 USD ($) | Apr. 30, 2012 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated other comprehensive (loss) income | $ (109.8) | $ (51.6) | $ (76.6) | $ (84.0)
Accounting Policies (Additional Textual) [Abstract] |  |  |  |
Company's total promotional expenditures, including amounts classified as a reduction of net sales, represented approximately in percentage of net sales | 29.00% | 27.00% | 25.00% |
Advertising expense | $ 107.0 | $ 124.7 | $ 131.6 |
Research and development costs | $ 32.5 | 24.3 | 24.7 |
Requisite performance period for share-based payments | 1 year |  |  |
Requisite service period for share-based payments | 4 years |  |  |
Compensation cost related to nonvested share-based awards not yet recognized | $ 48.9 |  |  |
Weighted-average period of recognition | 2 years 6 months |  |  |
Excess tax benefits realized upon exercise or vesting of share-based compensation | $ 5.9 | 7.3 | 2.9 |
Charges for defined contribution plans | 21.1 | 20.1 | 18.6 |
Allowance for doubtful accounts | 1.0 | 0.9 |  |
Work-in-process inventory | 81.5 | 62.1 |  |
Minimum operating lease obligations in 2016 | 43.1 |  |  |
Minimum operating lease obligations in 2017 | 40.5 |  |  |
Minimum operating lease obligations in 2018 | 36.0 |  |  |
Minimum operating lease obligations in 2019 | 27.1 |  |  |
Minimum operating lease obligations in 2020 | 22.0 |  |  |
Rent expense | 67.1 | 60.6 | 59.2 |
Fair value of funds for the payment of benefits associated with nonqualified retirement plans included in other noncurrent assets | 48.4 | 55.4 |  |
Unrealized pre-tax gains included in accumulated other comprehensive loss on available-for-sale securities | $ 5.2 | 5.3 |  |
Number of union contracts expiring in 2016 | Contract | 3 |  |  |
Facilities covered by union contracts | Facility | 10 |  |  |
Cash and cash equivalents maturity period | Three months or less |  |  |
The period under which uncertain tax positions are considered short term | 1 year |  |  |
Deferred net gains recognized in accumulated other comprehensive loss |  | 18.3 |  |
Number of reporting units | ReportingUnits | 6 |  |  |
Foreign Currency Translation Adjustment [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated other comprehensive (loss) income | $ (2.3) | $ 31.7 | $ 61.5 | $ 67.0
Machinery and equipment [Member] | Maximum [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Estimated useful life of assets | 20 years |  |  |
Machinery and equipment [Member] | Minimum [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Estimated useful life of assets | 3 years |  |  |
Capitalized software costs [Member] | Maximum [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Estimated useful life of assets | 7 years |  |  |
Capitalized software costs [Member] | Minimum [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Estimated useful life of assets | 1 year |  |  |
Buildings, fixtures, and improvements [Member] | Maximum [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Estimated useful life of assets | 40 years |  |  |
Buildings, fixtures, and improvements [Member] | Minimum [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Estimated useful life of assets | 5 years |  |  |
Seamild [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Percentage of equity interest acquired | 25.00% |  |  |
Equity method investment | $ 35.9 |  |  |
Natural Blend [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Percentage of equity interest acquired | 50.00% |  |  |
Equity method investment | $ 10.6 |  |  |
Mountain Country Foods [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Percentage of equity interest acquired | 20.00% |  |  |
Equity method investment | $ 19.1 |  |  |
Unionized Employees [Member] | Number of Employees, Total [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Percentage of concentration risk | 28.00% |  |  |
Unionized Employees Subject to Union Contracts Expiring within One Year | Number of Employees, Total [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Percentage of concentration risk | 11.00% |  |  |
2015 Options [Member] | Maximum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Requisite service and performance period for share based payments | 3 years |  |  |
2015 Options [Member] | Minimum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Requisite service and performance period for share based payments | 1 year |  |  |

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