Derivative Financial Instruments (Details 4) - USD ($) $ in Millions	Jul. 31, 2015	Apr. 30, 2015
Commodity contracts [Member]
Outstanding derivative contracts
Gross contract notional amount	$ 578.9	$ 640.6
Foreign currency exchange contracts [Member]
Outstanding derivative contracts
Gross contract notional amount	$ 104.5	$ 136.4

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

Name:	invest_DerivativeNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant