Reduction in Additional Paid In Capital As Result Of Common Stock Repurchases

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- Definition

Amount of the cumulative effect on retained earnings net of related income tax effect.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 250

-SubTopic 10

-Section 50

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=28359718&loc=d3e22663-107794

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- Definition

Number of shares that have been repurchased and retired during the period.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

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- Definition

Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

+ References

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- Definition

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

+ Details

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- Definition

Total cost of shares repurchased divided by the total number of shares repurchased.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 30

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

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Shareholder's Equity - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	12 Months Ended
	Apr. 30, 2014	Jan. 31, 2015	Jan. 31, 2014	May 27, 2014	Aug. 27, 2013	Feb. 23, 2015
Equity, Class of Treasury Stock [Line Items]
Common shares authorized for repurchase, shares				10,000,000	10,000,000
Stock repurchased and retired during period, common shares	9,699,700
Stock repurchased and retired during period, total cost	$ 353,315
Average cost per share	$ 36.43
Additional paid-in-capital reduction related to shares repurchased		128,935
Retained earnings reduction related to shares repurchased		(486,484)
Subsequent Event
Equity, Class of Treasury Stock [Line Items]
Common shares authorized for repurchase, shares						20,000,000
Employee Stock
Equity, Class of Treasury Stock [Line Items]
Stock repurchased and retired during period, common shares		111,563	9,520
Stock repurchased and retired during period, total cost		3,947	397
New Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Stock repurchased and retired during period, common shares		7,718,531
Stock repurchased and retired during period, total cost		$ 258,160
Average cost per share		$ 33.45