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Related Party (Details Textual) (USD $)	1 Months Ended	3 Months Ended	12 Months Ended		1 Months Ended
Related Party (Details Textual) (USD $)	Sep. 30, 2009	Oct. 31, 2009	Jan. 31, 2013	Jan. 31, 2012	Apr. 30, 2012 Chief Executive Officer [Member]	Sep. 01, 2009 President [Member]	Oct. 31, 2012 Mr Styslinger [Member]
Percentage Holding By Related Party						32.00%
Related Party Transaction, Expenses from Transactions with Related Party	$ 36,600,000	$ 0
Stock Repurchased During Period, Shares (in shares)			764,024		63,000
Stock Repurchased During Period, Value			6,200,000		500,000
Stock Repurchase Price Per Share (in dollars per share)			$ 8.12		$ 8.00
Other accrued expenses			$ 16,173,000	$ 13,345,000			$ 1,000,000

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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