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Stock Based Compensation (Parenthetical) (Details) | 0 Months Ended | 6 Months Ended
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Oct. 15, 1996 | Jul. 31, 2013 Two Thousand Eleven Stock Incentive Plan [Member] Restricted Stock Issued Six Nineteen Two Thousand Twelve Vesting One Year [Member] | Jul. 31, 2013 Two Thousand Eleven Stock Incentive Plan [Member] Restricted Stock Issued Six Nineteen Two Thousand Twelve Vesting Five Year [Member] | Jul. 31, 2013 Two Thousand Seven Stock Incentive Plan [Member] Restricted Stock Issued Six Nineteen Two Thousand Twelve Vesting One Year [Member] | Jul. 31, 2013 Two Thousand Seven Stock Incentive Plan [Member] Restricted Stock Issued On Two Thousand Eleven Six Twenty One Vesting Over One Year [Member] | Jul. 31, 2013 Two Thousand Seven Stock Incentive Plan [Member] Restricted Stock Issued On Two Thousand Ten Six Eight Vesting Over One Year [Member] | Jul. 31, 2013 Two Thousand Seven Stock Incentive Plan [Member] Restricted Stock Issued On Two Thousand Nine Six Sixteen Vesting Over Five Years [Member] | Jul. 31, 2013 Two Thousand Seven Stock Incentive Plan [Member] Restricted Stock Issued On Two Thousand Seven Six Nineteen Vesting Over Five Years [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stockholders Rights Condition Description | Each of the Rights entitles a stockholder to purchase for an exercise price of $50.00 ($20.70, as adjusted for stock splits and stock dividends), subject to adjustment, one one-hundredth of a share of Series A Junior Participating Cumulative Preferred Stock of the Company, or under certain circumstances, shares of common stock of the Company or a successor company with a market value equal to two times the exercise price. |  |  |  |  |  |  |
Maximum term of stock options |  | 1 year | 5 years | 1 year | 1 year | 1 year | 5 years | 5 years

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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 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Stockholders rights condition description. + References No definition available. + Details
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