This element represents the total fair market value of investments in certain entities that calculate net asset value per share (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments). This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements, but may also be used in both the balance sheet and disclosure in the same submission. This item represents alternative investments as of the balance sheet date which may include investments in certain hedge funds, venture capital funds, private equity funds, real estate partnerships or funds, and any other investment in which investee management calculates net asset value per share as the primary metric for investment value.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.

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- Definition

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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FAIR VALUE MEASUREMENTS (Details) (USD $)					3 Months Ended
FAIR VALUE MEASUREMENTS (Details) (USD $)	Jul. 31, 2012	Jan. 31, 2012	Jul. 31, 2012 Designated as Hedging Instrument [Member] Other Liabilities [Member]	Jan. 31, 2012 Designated as Hedging Instrument [Member] Other Liabilities [Member]	Jul. 31, 2012 Interest Rate Swap [Member]	Jul. 31, 2012 Interest Rate Swap [Member] Designated as Hedging Instrument [Member] Other Liabilities [Member]	Jan. 31, 2012 Interest Rate Swap [Member] Designated as Hedging Instrument [Member] Other Liabilities [Member]	Jul. 31, 2012 Level 1 [Member] Fair Value, Measurements, Recurring [Member]	Jan. 31, 2012 Level 1 [Member] Fair Value, Measurements, Recurring [Member]	Jul. 31, 2012 Level 2 [Member] Fair Value, Measurements, Recurring [Member]	Jan. 31, 2012 Level 2 [Member] Fair Value, Measurements, Recurring [Member]	Jul. 31, 2012 Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Jan. 31, 2012 Level 3 [Member] Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market mutual funds								$ 50,180,000	$ 48,242,000	$ 0	$ 0	$ 0	$ 0
Interest rate swap								0		857,000		0
Cash deposited with commercial banks	23,700,000	28,700,000
Derivatives, Fair Value [Line Items]
Derivative liability, fair value			(857,000)	0		(857,000)	0
Change in fair value recognized in net income					$ 900,000