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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 205G

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 44C
-Subparagraph a
-Clause 1

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
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Pre tax change in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges, net of reclassifications into earnings during the period. A cash flow hedge is a hedge of the exposure to variability in the cash flows of a recognized asset or liability or a forecasted transaction that is attributable to a particular risk. Includes an entity's share of an equity investee's increase (decrease) in deferred hedging gains or losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 14, 17, 20, 24, 26

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 14, 17, 20, 26

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 45
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 31, 46

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph c(3)

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 24
-Subparagraph b

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 46

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Derivative Financial Instruments (Details) (USD $) In Thousands	3 Months Ended
	Jul. 31, 2011	Jul. 31, 2010	Apr. 30, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Change in accumulated other comprehensive (loss) income	$ (12,122)	$ 8,968
Gains and losses recognized in cost of products sold on derivatives not designated as qualified hedging instruments
Gains recognized in cost of products sold (derivatives not designated as hedging instruments)	13,782	4,870
Outstanding derivative contracts
Gross contract notional amount	376,000
Derivative Financial Instruments (Textuals)
Cash margin accounts related to derivative instruments recognized	4,077		12,292
Deferred pretax loss/gain included in accumulated other comprehensive income (loss/gain)	2,692		(9,430)
Tax impact related to deferred losses and gains on cash flow hedges included in accumulated other comprehensive (loss) income	(979)		3,430
Maximum expected recognized period of deferred gain/loss in earnings	1 year
Other Current Assets [Member]
Fair value of derivative instruments [Line Items]
Derivative asset designated as hedging instrument	8,833		8,831
Derivative asset not designated as hedging instrument	13,278		10,204
Total derivatives instruments, Assets	22,111		19,035
Other Current Assets [Member] \| Commodity contracts [Member]
Fair value of derivative instruments [Line Items]
Derivative asset designated as hedging instrument	914		3,408
Derivative asset not designated as hedging instrument	13,092		9,887
Other Current Assets [Member] \| Interest rate contract [Member]
Fair value of derivative instruments [Line Items]
Derivative asset designated as hedging instrument	7,919		5,423
Other Current Assets [Member] \| Foreign currency exchange contracts [Member]
Fair value of derivative instruments [Line Items]
Derivative asset not designated as hedging instrument	186		317
Other Noncurrent Assets [Member]
Fair value of derivative instruments [Line Items]
Derivative asset designated as hedging instrument	10,569
Derivative asset not designated as hedging instrument	29
Total derivatives instruments, Assets	10,598
Other Noncurrent Assets [Member] \| Commodity contracts [Member]
Fair value of derivative instruments [Line Items]
Derivative asset designated as hedging instrument	0
Other Noncurrent Assets [Member] \| Interest rate contract [Member]
Fair value of derivative instruments [Line Items]
Derivative asset designated as hedging instrument	10,569
Other Noncurrent Assets [Member] \| Foreign currency exchange contracts [Member]
Fair value of derivative instruments [Line Items]
Derivative asset designated as hedging instrument	29
Other Current Liabilities [Member]
Fair value of derivative instruments [Line Items]
Derivative liability designated as hedging instrument	598		0
Derivative liability not designated as hedging instrument	6,144		8,636
Total derivatives instruments, Liabilities	6,742		8,636
Other Current Liabilities [Member] \| Commodity contracts [Member]
Fair value of derivative instruments [Line Items]
Derivative liability designated as hedging instrument	598		0
Derivative liability not designated as hedging instrument	4,181		5,432
Other Current Liabilities [Member] \| Interest rate contract [Member]
Fair value of derivative instruments [Line Items]
Derivative liability designated as hedging instrument	0		0
Other Current Liabilities [Member] \| Foreign currency exchange contracts [Member]
Fair value of derivative instruments [Line Items]
Derivative liability not designated as hedging instrument	1,963		3,204
Other Noncurrent Liabilities [Member]
Fair value of derivative instruments [Line Items]
Derivative liability designated as hedging instrument			1,384
Derivative liability not designated as hedging instrument			0
Total derivatives instruments, Liabilities			1,384
Other Noncurrent Liabilities [Member] \| Commodity contracts [Member]
Fair value of derivative instruments [Line Items]
Derivative liability designated as hedging instrument			0
Derivative liability not designated as hedging instrument			0
Other Noncurrent Liabilities [Member] \| Interest rate contract [Member]
Fair value of derivative instruments [Line Items]
Derivative liability designated as hedging instrument			1,384
Other Noncurrent Liabilities [Member] \| Foreign currency exchange contracts [Member]
Fair value of derivative instruments [Line Items]
Derivative liability not designated as hedging instrument			0
Commodity contracts [Member]
Gains and losses recognized in cost of products sold on derivatives not designated as qualified hedging instruments
Gains recognized in cost of products sold (derivatives not designated as hedging instruments)	13,697	4,393
Outstanding derivative contracts
Gross contract notional amount	965,726		869,107
Derivative Financial Instruments (Textuals) [Abstract]
Derivative instrument maturity	1 year
Interest rate contract [Member]
Outstanding derivative contracts
Gross contract notional amount	376,000		376,000
Foreign currency exchange contracts [Member]
Gains and losses recognized in cost of products sold on derivatives not designated as qualified hedging instruments
Gains recognized in cost of products sold (derivatives not designated as hedging instruments)	85	477
Outstanding derivative contracts
Gross contract notional amount	100,602		73,158
Derivative Financial Instruments (Textuals) [Abstract]
Derivative instrument maturity	1 year
Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
(Losses) gains recognized in other comprehensive (loss) income (effective portion)	(6,014)	8,931
Gains/Losses reclassified from accumulated other comprehensive (loss) income to cost of products sold (effective portion)	6,108	(37)
Change in accumulated other comprehensive (loss) income	(12,122)	8,968
(Losses) gains recognized in cost of products sold (ineffective portion)	$ (121)	$ 171