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Condensed Consolidated Financial Statements (Details) - USD ($) $ in Millions	Jan. 31, 2016	Apr. 30, 2015
ASU 2015-17 [Member] \| Other Assets, Net [Member]
New Accounting Pronouncements [Line Items]
New Accounting Pronouncement, Cumulative Effect of Change on Equity or Net Assets		$ (101.5)
ASU 2015-17 [Member] \| Other Long-Term Liabilities [Member]
New Accounting Pronouncements [Line Items]
New Accounting Pronouncement, Cumulative Effect of Change on Equity or Net Assets		0.3
ASU 2015-17 [Member] \| Prepaid Expenses and Other Current Assets [Member]
New Accounting Pronouncements [Line Items]
New Accounting Pronouncement, Cumulative Effect of Change on Equity or Net Assets		101.5
ASU 2015-17 [Member] \| Accounts Payable and Accrued Liabilities [Member]
New Accounting Pronouncements [Line Items]
New Accounting Pronouncement, Cumulative Effect of Change on Equity or Net Assets		(0.3)
ASU 2015-03 [Member] \| Other Assets, Net [Member]
New Accounting Pronouncements [Line Items]
New Accounting Pronouncement, Cumulative Effect of Change on Equity or Net Assets	$ 8.1	8.5
ASU 2015-03 [Member] \| Long-term Debt [Member]
New Accounting Pronouncements [Line Items]
New Accounting Pronouncement, Cumulative Effect of Change on Equity or Net Assets	$ (8.1)	$ (8.5)

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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