Cash, Cash Equivalents and Short Term Investments	3 Months Ended
Apr. 30, 2015
Cash and Cash Equivalents [Abstract]
Cash, Cash Equivalents and Short Term Investments	NOTE 3 – CASH, CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS The Company considers all liquid investments with original maturities of three months or less at the time of purchase to be cash equivalents. At April 30 and January 31, 2015, a significant portion of the balance of cash and cash equivalents was invested in money market funds with net assets invested in high-quality money market instruments. The funds are sponsored by an investment division of Bank of America (the “Bank”). Cash equivalents at April 30, 2015 also included certificates of deposit issued by the Bank. The Company’s short-term investments as of April 30, 2015, which consisted solely of certificates of deposit issued by the Bank with original maturities ranging from August to October 2015, are considered to be held-to-maturity securities; the total carrying value amount as of April 30, 2015 included accrued interest of $17,000. The amounts of cash, cash equivalents and short-term investments in the condensed consolidated balance sheet as of April 30, 2015 included amounts held by the consolidated joint venture entities that are discussed in Note 2 above. Such amounts, which included cash, cash equivalents and short-term investments that amounted to approximately $105.3 million and $24.0 million as of April 30, 2015, respectively, will be used to cover future construction costs incurred under the EPC Contracts.

NOTE 3 – CASH, CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS

The Company considers all liquid investments with original maturities of three months or less at the time of purchase to be cash equivalents. At April 30 and January 31, 2015, a significant portion of the balance of cash and cash equivalents was invested in money market funds with net assets invested in high-quality money market instruments. The funds are sponsored by an investment division of Bank of America (the “Bank”). Cash equivalents at April 30, 2015 also included certificates of deposit issued by the Bank. The Company’s short-term investments as of April 30, 2015, which consisted solely of certificates of deposit issued by the Bank with original maturities ranging from August to October 2015, are considered to be held-to-maturity securities; the total carrying value amount as of April 30, 2015 included accrued interest of $17,000.

The amounts of cash, cash equivalents and short-term investments in the condensed consolidated balance sheet as of April 30, 2015 included amounts held by the consolidated joint venture entities that are discussed in Note 2 above. Such amounts, which included cash, cash equivalents and short-term investments that amounted to approximately $105.3 million and $24.0 million as of April 30, 2015, respectively, will be used to cover future construction costs incurred under the EPC Contracts.