FINANCIAL INSTRUMENTS (Details) (USD $) | 9 Months Ended |
In Thousands, unless otherwise specified | Nov. 30, 2014 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |
Adjusted Cost | $39,974 |
Unrealized Gains (Losses) | -3 |
Fair Value | 39,971 |
Cash and Cash Equivalents [Member] | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |
Fair Value | 23,964 |
Short-Term Marketable Securities [Member] | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |
Fair Value | 12,963 |
Long-Term Marketable Securities [Member] | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |
Fair Value | 3,044 |
Cash [Member] | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |
Adjusted Cost | 17,026 |
Unrealized Gains (Losses) | |
Fair Value | 17,026 |
Cash [Member] | Cash and Cash Equivalents [Member] | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |
Fair Value | 17,026 |
Cash [Member] | Short-Term Marketable Securities [Member] | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |
Fair Value | |
Cash [Member] | Long-Term Marketable Securities [Member] | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |
Fair Value | |
Level 1 [Member] | U.S. Treasury Securities [Member] | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |
Adjusted Cost | 1,000 |
Unrealized Gains (Losses) | |
Fair Value | 1,000 |
Level 1 [Member] | U.S. Treasury Securities [Member] | Cash and Cash Equivalents [Member] | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |
Fair Value | |
Level 1 [Member] | U.S. Treasury Securities [Member] | Short-Term Marketable Securities [Member] | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |
Fair Value | 1,000 |
Level 1 [Member] | U.S. Treasury Securities [Member] | Long-Term Marketable Securities [Member] | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |
Fair Value | |
Level 2 [Member] | Repurchase Agreements [Member] | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |
Adjusted Cost | 8,938 |
Unrealized Gains (Losses) | |
Fair Value | 8,938 |
Level 2 [Member] | Repurchase Agreements [Member] | Cash and Cash Equivalents [Member] | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |
Fair Value | 6,938 |
Level 2 [Member] | Repurchase Agreements [Member] | Short-Term Marketable Securities [Member] | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |
Fair Value | 2,000 |
Level 2 [Member] | Repurchase Agreements [Member] | Long-Term Marketable Securities [Member] | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |
Fair Value | |
Level 2 [Member] | Commercial Paper [Member] | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |
Adjusted Cost | 13,010 |
Unrealized Gains (Losses) | -3 |
Fair Value | 13,007 |
Level 2 [Member] | Commercial Paper [Member] | Cash and Cash Equivalents [Member] | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |
Fair Value | |
Level 2 [Member] | Commercial Paper [Member] | Short-Term Marketable Securities [Member] | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |
Fair Value | 9,963 |
Level 2 [Member] | Commercial Paper [Member] | Long-Term Marketable Securities [Member] | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |
Fair Value | $3,044 |