Actual expense incurred during fiscal year 2011 for the Company's New York headquarters relocation. This expense is primarily related to the fair value of the remaining non-cancelable lease obligations reduced by the estimated sublease rental income as well as the acceleration of the useful lives of certain property and equipment, incremental rent expense during the transition period and lease termination payments.

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- Definition

Commitment and contingencies.

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Commitment and contingencies.

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- Definition

The expense related to the fair value of the remaining non-cancelable lease obligations reduced by the estimated sublease rental income for the Company's New York headquarters relocation

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- Definition

The fixed interest rate of the loans receivable, applicable only if the fixed interest rate exceeds the sum of the values of Loans Receivable Description Of Variable Rate Basis and Loans Receivable Basis Spread On Variable Rate.

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- Definition

Reflects the amount of cash required to fully fund agreements to provide advances to borrowers and lessees at interest rates that increase or decrease depending on certain facts or circumstances.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 01-6
-Paragraph 14
-Subparagraph m
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 942
-SubTopic 825
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6480020&loc=d3e61082-112788

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 825
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=6480020&loc=d3e61044-112788

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The percentage points (also referred to as 'margin') added to the reference rate as stated in the loan agreement and used to compute the variable rate on the loans receivable. For instance, the loan agreement might state that the interest rate the borrower is obligated to pay is the London Interbank Offered Rate (LIBOR) plus three quarters (3/4) of a percentage point adjusted quarterly (each three months). LIBOR in this example is the index or reference rate, 3/4 percentage point is the margin, the reference rate plus the margin is the fully indexed rate. This element would be used to report separately the margin.

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The reference rate for the variable rate of the loans receivable, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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Commitments and Contingencies (Details Textuals) (USD $)	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended		6 Months Ended
	Jul. 31, 2011	Mar. 31, 2011 Laurelton Diamonds, Inc. [Member]	Jul. 31, 2011 Laurelton Diamonds, Inc. [Member]	Jul. 31, 2011 General and Administrative Expense [Member]	Jul. 31, 2010 General and Administrative Expense [Member]	Jul. 31, 2011 General and Administrative Expense [Member]	Jul. 31, 2010 General and Administrative Expense [Member]
Commitment and Contingencies (Textuals)
Amount of term loan given		$ 50,000,000
Loans Receivable, Basis Spread on Variable Rate			3.50%
Interest rate on loan (per annum)			LIBOR
Loans Receivable Fixed Rate			4.00%
Commitment and Contingencies Additional (Textuals)
Lease exit charge	30,884,000					30,884,000
Actual expense incurred for New York headquarters relocation				$ 34,497,000	$ 3,945,000	$ 42,719,000	$ 4,805,000