Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(1)(i)

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

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph g(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 64

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 14.F)

-URI http://asc.fasb.org/extlink&oid=6793087&loc=d3e301413-122809

+ Details

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Balance Type:	debit
Period Type:	duration

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- Definition

Aggregate unrecognized cost of option awards made to employees under a stock option plan or plans, that have yet to vest.

+ References

No definition available.

+ Details

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

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

-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 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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- Definition

Share based compensation arrangement by share based payment award restricted at period.

+ References

No definition available.

+ Details

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Stock Based Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2012	Jul. 31, 2011
Summary of restricted stock and stock unit awards
Date of Grants			Oct. 25, 2016
Terms of Vesting			10 years
Totals for the period			$ 415	$ 381
Restricted Stock Units (RSUs) [Member]
Summary of restricted stock and stock unit awards
Totals for the period	154,000	181,000	415,000	381,000
2011 Stock Incentive Plan [Member] \| Restricted Stock, issued 6/19/2012, vesting over 1 year [Member]
Summary of restricted stock and stock unit awards
Date of Grants			Jun. 19, 2012
Units Granted			31,250
Terms of Vesting			1 year
Allocated Share-based Compensation Expense	8,286		8,286
Unamortized Compensation	41,429		41,429
2011 Stock Incentive Plan [Member] \| Restricted Stock, issued 6/19/2012, vesting over 5 years [Member]
Summary of restricted stock and stock unit awards
Date of Grants			Jun. 19, 2012
Units Granted			520,000
Terms of Vesting			5 years
Allocated Share-based Compensation Expense	28,000		28,000
Unamortized Compensation	804,000		804,000
2007 Stock Incentive Plan [Member] \| Restricted Stock, issued 6/19/2012, vesting over 1 year [Member]
Summary of restricted stock and stock unit awards
Date of Grants			Jun. 19, 2012
Units Granted			78,125
Terms of Vesting			1 year
Allocated Share-based Compensation Expense	20,714		20,714
Unamortized Compensation	103,571		103,571
2007 Stock Incentive Plan [Member] \| Restricted Stock, issued 3/21/2012, vesting immediately [Member]
Summary of restricted stock and stock unit awards
Date of Grants			Mar. 21, 2012
Units Granted			40,000
Allocated Share-based Compensation Expense			80,000
Unamortized Compensation
2007 Stock Incentive Plan [Member] \| Restricted Stock, issued 6/21/2011, vesting over 1 year [Member]
Summary of restricted stock and stock unit awards
Date of Grants			Jun. 21, 2011
Units Granted			68,960
Terms of Vesting			1 year
Allocated Share-based Compensation Expense	17,000	33,000	67,000	33,000
Unamortized Compensation
2007 Stock Incentive Plan [Member] \| Restricted Stock, issued 6/8/2010, vesting over 1 year [Member]
Summary of restricted stock and stock unit awards
Date of Grants			Jun. 08, 2010
Units Granted			56,455
Terms of Vesting			1 year
Allocated Share-based Compensation Expense		15,000		58,000
Unamortized Compensation
2007 Stock Incentive Plan [Member] \| Restricted Stock, issued 6/16/2009, vesting over 5 years [Member]
Summary of restricted stock and stock unit awards
Date of Grants			Jun. 16, 2009
Units Granted			382,500
Terms of Vesting			5 years
Allocated Share-based Compensation Expense	56,000	58,000	113,000	125,000
Unamortized Compensation	414,000		414,000
2007 Stock Incentive Plan [Member] \| Restricted Stock Units, issued 6/19/2007, vesting over 5 years [Member]
Summary of restricted stock and stock unit awards
Date of Grants			Jun. 19, 2007
Units Granted			262,500
Terms of Vesting			5 years
Allocated Share-based Compensation Expense	24,000	75,000	98,000	165,000
Unamortized Compensation