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Derivative Financial Instruments (Details 4) - USD ($) $ in Millions	Apr. 30, 2018	Apr. 30, 2017
Commodity contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gross contract notional amount	$ 658.0	$ 704.9
Foreign currency exchange contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gross contract notional amount	$ 122.1	$ 195.4

X

- Definition

Aggregate notional amount specified by the derivative(s).

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: