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Acquisitions - Narrative (Details) $ in Millions			12 Months Ended
		May 14, 2018 USD ($) Facility	Apr. 30, 2018 USD ($) shares	Apr. 30, 2017 USD ($) shares	Apr. 30, 2016 USD ($)
Acquisitions (Textual) [Abstract]
Common shares outstanding | shares			113,572,840	113,439,553
Cash payments for acquisitions			$ 0.0	$ 0.0	$ (7.9)
Long-term debt, less current portion	[1]		4,688.0	4,445.5
Goodwill			5,942.2	6,077.1	$ 6,091.1
Debt Instrument, Face Amount			4,700.0	$ 4,950.0
Subsequent Event [Member] | Ainsworth [Member]
Acquisitions (Textual) [Abstract]
Cash payments for acquisitions		$ 1,900.0
Commercial Paper		$ 400.0
Number of facilities acquired | Facility		2
Business Combination, Integration Related Costs, Expected		$ 50.0
Term Loan Credit Agreement [Member]
Acquisitions (Textual) [Abstract]
Debt Instrument, Face Amount			$ 0.0
Term Loan Credit Agreement [Member] | Subsequent Event [Member] | Ainsworth [Member]
Acquisitions (Textual) [Abstract]
Debt Instrument, Face Amount		$ 1,500.0
[1] Represents the carrying amount included in the Consolidated Balance Sheets, which includes the impact of terminated interest rate contracts, offering discounts, and capitalized debt issuance costs.

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Expected costs to be incurred to effect a business combination. Such costs could include employee-related costs, outside service and consulting costs, and other costs directly related to the acquisition.

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Number of facilities acquired.

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Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Face (par) amount of debt instrument at time of issuance.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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