Equity and Incentive Compensation Plans - Summary of Stock Incentive Plan (Detail)	12 Months Ended
Jan. 31, 2015 plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Active Stock Incentive Plans	2ann_NumberOfActiveStockIncentivePlans
Stock Incentive Plan 2002
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total authorized shares reserved for issuance	4,500,000
Shares Reserved for Issuance at January 31, 2015	145,726
Shares available for future grant	0
Stock Incentive Plan 2003
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Reserved for Issuance at January 31, 2015	4,433,729
Shares available for future grant	2,882,232
Restricted Stock And Restricted Units \| Stock Incentive Plan 2002
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total authorized shares reserved for issuance	787,500
Restricted Stock And Restricted Units \| Stock Incentive Plan 2003
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total authorized shares reserved for issuance	7,434,432
Before Amendment [Member] \| Stock Incentive Plan 2003
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total authorized shares reserved for issuance	11,750,000
After Amendment [Member] \| Stock Incentive Plan 2003
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total authorized shares reserved for issuance	13,400,000

The Company has three active stock incentive plans as of the date associated with this tag.

No definition available.

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- Definition

The number of shares authorized under the plan specified which related to either shares that have been granted as options or restricted stock units, but not yet issued due to lack of exercise and/or passage of time, or shares which are authorized under the plan specified but not yet granted.

+ References

No definition available.

+ Details

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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