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Commitments And Contingencies (Narrative) (Details) (USD $)	12 Months Ended
	Jan. 31, 2012 years	Jan. 31, 2011 Sto	Jan. 31, 2010
Commitments And Contingencies (Line Items)
Number of lease commitment not opened		36
Commitments for un-fulfilled purchase orders	$ 315,890,000
Commitments with construction contractors	16,292,000
U.S. based employees age limit to participate in 401(k) Saving Plan	18
Employer matching contribution per employee	0.25
Percentage of employee contribution for first threshold limit of employer contribution	6.00%
Employees contribution percentage vested	100.00%
Percentage of employers contribution per year vested	20.00%
Company's contribution to Savings Plan	$ 1,365,000	$ 1,308,000	$ 1,171,000
Maximum [Member]
Commitments And Contingencies (Line Items)
Percentage of compensation deferred by employees under Saving Plan	25.00%
Minimum [Member]
Commitments And Contingencies (Line Items)
Percentage of compensation deferred by employees under Saving Plan	1.00%

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Commitments For Contracts With Construction Contractors

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The amount of the cost recognized during the period for defined contribution plans.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 11

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 70

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942

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