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Reconciliation of Weighted Average Common Shares Outstanding Used for Computation of Basic and Diluted Net Income Per Common Share (Detail)	12 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013
Earnings Per Share [Line Items]
Basic weighted-average common shares outstanding	136,651,899us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	147,014,869us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	145,253,691us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive options, stock appreciation rights, restricted stock units and performance stock units	1,540,835us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	2,211,037us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	1,410,040us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Diluted weighted-average shares outstanding	138,192,734us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	149,225,906us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	146,663,731us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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- Definition

The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 16

-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1505-109256

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- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256



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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Weighted-Average Number of Common Shares Outstanding

-URI http://asc.fasb.org/extlink&oid=6528421

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