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Accounting Policies - Narrative (Details) $ in Millions	12 Months Ended
Accounting Policies - Narrative (Details) $ in Millions	Apr. 30, 2021 USD ($) Contract Facility	Apr. 30, 2020 USD ($)	Apr. 30, 2019 USD ($)	Apr. 30, 2018 USD ($)
Accounting Policies (Additional Textual) [Abstract]
Subsequent Period Adjustments Included In Consolidated Pretax Income And Cash Provided By Operating Activities, Percent	2.00%	2.00%	2.00%
Promotional Expenditures As Percentage Of Net Sales	39.00%	39.00%	36.00%
Advertising expense	$ 224.4	$ 198.6	$ 237.5
Charges for defined contribution plans	41.2	39.7	37.1
Reserve for credit loss	2.4	3.0
Lease expense	108.7	112.8	99.2
Unrealized pre-tax gains included in accumulated other comprehensive loss on available-for-sale securities	4.9	5.0
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	334.3	391.1	101.3	$ 192.6
Accumulated other comprehensive income (loss)	(277.4)	(379.0)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost related to nonvested share-based awards not yet recognized	$ 45.0
Weighted-average period of recognition	2 years
Excess tax deficiencies realized upon exercise or vesting of share-based compensation	$ 0.1
Excess tax benefits realized upon exercise or vesting of share-based compensation		0.9	0.5
Concentration Risk [Line Items]
Facilities covered by union contracts \| Facility	8
Number of union contracts expiring in 2022 \| Contract	5
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Accumulated other comprehensive income (loss)	$ (9.0)	(50.5)
Selling, Distribution And Administrative Expense
Condensed Financial Statements, Captions [Line Items]
Costs and Expenses	281.8	286.4	266.6
Research and development costs	$ 57.7	57.7	$ 56.0
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for share-based payments	1 year
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for share-based payments	3 years
Machinery and equipment [Member] \| Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life of assets	3 years
Machinery and equipment [Member] \| Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life of assets	20 years
Capitalized software costs [Member] \| Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life of assets	1 year
Capitalized software costs [Member] \| Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life of assets	7 years
Buildings, fixtures, and improvements [Member] \| Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life of assets	5 years
Buildings, fixtures, and improvements [Member] \| Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life of assets	40 years
Mountain Country Foods [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of equity interest acquired	20.00%
Numi, Inc. [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of equity interest acquired	42.00%
Unionized Employees [Member] \| Number of Employees, Total [Member]
Concentration Risk [Line Items]
Percentage of concentration risk	24.00%
Unionized Employees Subject to Union Contracts Expiring within One Year \| Number of Employees, Total [Member]
Concentration Risk [Line Items]
Percentage of concentration risk	8.00%
Work In Process Inventory
Condensed Financial Statements, Captions [Line Items]
Work-in-process inventory	$ 63.8	65.4
Other Noncurrent Assets
Condensed Financial Statements, Captions [Line Items]
Fair value of funds for the payment of benefits associated with nonqualified retirement plans included in other noncurrent assets	31.0	38.6
Cash Equivalents [Member]
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	294.5	300.2
Accounts Payable [Member]
Condensed Financial Statements, Captions [Line Items]
Supplier Financing, Outstanding Payment Obligations	$ 304.2	$ 157.5