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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Concepts (CON)

-Number 6

-Paragraph 25

Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Regulation S-X (SX)

-Number 210

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 12

-Article 7

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Amount of long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets, located in the entity's country of domicile.

+ References

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

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-Name Statement of Financial Accounting Standard (FAS)

-Number 131

-Paragraph 38

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

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-Name Statement of Financial Accounting Standard (FAS)

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Revenues from external customers attributed to the entity's country of domicile.

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

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-Name Statement of Financial Accounting Standard (FAS)

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Revenues from external customers attributed to all foreign countries in total from which the entity derives revenues.

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Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

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

-Publisher SEC

-Name Regulation S-X (SX)

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-Section 03

-Paragraph 1

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Reportable Segments (Details 1) (USD $) In Thousands	3 Months Ended		12 Months Ended
Reportable Segments (Details 1) (USD $) In Thousands	Jul. 31, 2011	Jul. 31, 2010	Apr. 30, 2011	Apr. 30, 2010	Apr. 30, 2009
Net sales:
Domestic			$ 4,358,091	$ 4,167,042	$ 3,353,362
Total International			467,652	438,247	404,571
Total net sales	1,188,883	1,047,312	4,825,743	4,605,289	3,757,933
Assets:
Total assets	8,782,023		8,324,585	7,974,853	8,192,161
Long-lived assets:
Domestic			6,502,749	6,543,440	6,406,085
Total international			184,837	207,783	387,185
Total long-lived assets			6,687,586	6,751,223	6,793,270
Domestic [Member]
Assets:
Total assets			7,912,311	7,591,931	7,670,192
Canada [Member]
Net sales:
Total International			409,710	385,870	356,300
Assets:
Total assets			406,576	376,788	514,993
Long-lived assets:
Total international			184,624	207,517	386,948
All other international [Member]
Net sales:
Total International			57,942	52,377	48,271
Assets:
Total assets			5,698	6,134	6,976
Long-lived assets:
Total international			213	266	237
Total international [Member]
Assets:
Total assets			$ 412,274	$ 382,922	$ 521,969