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Amount of stock repurchase plan authorized.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

Expiration date for the purchase of an entity's own shares under a stock repurchase plan, in the CCYY-MM-DD format.

+ 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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Data Type:	num:perShareItemType
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- Definition

Number of shares of common and preferred stock retired from treasury during the period.

+ References

+ Details

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Period Type:	duration

- Definition

Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

+ 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 FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 4: 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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Balance Type:	debit
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Period Type:

Treasury Stock (Details Textual) (USD $)	3 Months Ended
Treasury Stock (Details Textual) (USD $)	Apr. 30, 2015	Apr. 30, 2014	Nov. 25, 2014	Mar. 21, 2013
Equity Class Of Treasury Stock [Line Items]
Stock repurchase program, number of shares authorized			$ 100,000,000	$ 50,000,000
Stock repurchase program expiration date	Jan. 31, 2016
Stock repurchase program, number of shares repurchased	859,700us-gaap_TreasuryStockSharesRetired	133,073us-gaap_TreasuryStockSharesRetired
Stock repurchase program, total cost of shares repurchased	$ 22,154,000	$ 5,312,000
Stock repurchase program, average per share price of shares repurchased	$ 25.77	$ 39.92
Surrender of Shares by Employee
Equity Class Of Treasury Stock [Line Items]
Stock repurchase program, number of shares repurchased	17,979