Segment Information (Details 1) (USD $) In Thousands	3 Months Ended	6 Months Ended
Jul. 31, 2011	Jul. 31, 2010	Jul. 31, 2011	Jul. 31, 2010
Reconciliation of segments earnings from continuing operations to Company's consolidated earnings from continuing operations before income taxes
Earnings from continuing operations for segments	$ 208,121	$ 142,267	$ 382,805	$ 275,235
Unallocated corporate expenses	(33,084)	(24,716)	(63,580)	(51,407)
Interest and other expenses, net	(9,619)	(11,121)	(19,766)	(23,259)
Other (expense) income	(34,497)	(3,945)	(42,719)	(4,805)
Earnings from operations before income taxes	$ 130,921	$ 102,485	$ 256,740	$ 195,764

The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement.

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Segment Reporting Earnings (losses) from continuing operations before unallocated corporate expenses, interest and other expenses, net and other (expense) income.

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Unallocated corporate expenses.

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- Definition

Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 4
-Section 08
-Paragraph h
-Subparagraph 1(i)

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h)(1)(i))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

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- Definition

The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 5
-Section 03
-Paragraph 7

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.7)
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

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