CASH, CASH EQUIVALENTS AND INVESTMENTS (Details) $ in Thousands | Nov. 30, 2015USD ($) |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Adjusted Cost | $ 226,933 | |
Unrealized Gains (Losses) | (72) | |
Fair Value | 226,861 | |
Cash and Cash Equivalents [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Fair Value | 106,678 | |
Short-Term Marketable Securities [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Fair Value | 116,657 | |
Other Assets [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Fair Value | 3,526 | |
Cash [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Adjusted Cost | $ 7,005 | |
Unrealized Gains (Losses) | | |
Fair Value | $ 7,005 | |
Cash [Member] | Cash and Cash Equivalents [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Fair Value | $ 7,005 | |
Cash [Member] | Short-Term Marketable Securities [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Fair Value | | |
Cash [Member] | Other Assets [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Fair Value | | |
Level 1 [Member] | Domestic Equities [Member | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Adjusted Cost | $ 373 | |
Unrealized Gains (Losses) | 52 | |
Fair Value | $ 425 | |
Level 1 [Member] | Domestic Equities [Member | Cash and Cash Equivalents [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Fair Value | | |
Level 1 [Member] | Domestic Equities [Member | Short-Term Marketable Securities [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Fair Value | $ 425 | |
Level 1 [Member] | Domestic Equities [Member | Other Assets [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Fair Value | | |
Level 1 [Member] | Commercial Paper [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Adjusted Cost | $ 73 | |
Unrealized Gains (Losses) | | |
Fair Value | $ 73 | |
Level 1 [Member] | Commercial Paper [Member] | Cash and Cash Equivalents [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Fair Value | $ 73 | |
Level 1 [Member] | Commercial Paper [Member] | Short-Term Marketable Securities [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Fair Value | | |
Level 1 [Member] | Commercial Paper [Member] | Other Assets [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Fair Value | | |
Level 1 [Member] | Mutual funds [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Adjusted Cost | $ 3,564 | [1] |
Unrealized Gains (Losses) | (38) | [1] |
Fair Value | $ 3,526 | [1] |
Level 1 [Member] | Mutual funds [Member] | Cash and Cash Equivalents [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Fair Value | | [1] |
Level 1 [Member] | Mutual funds [Member] | Short-Term Marketable Securities [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Fair Value | | [1] |
Level 1 [Member] | Mutual funds [Member] | Other Assets [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Fair Value | $ 3,526 | [1] |
Level 2 [Member] | Commercial Paper [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Adjusted Cost | $ 15,970 | |
Unrealized Gains (Losses) | | |
Fair Value | $ 15,970 | |
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 | $ 15,970 | |
Level 2 [Member] | Commercial Paper [Member] | Other Assets [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 | $ 99,600 | |
Unrealized Gains (Losses) | | |
Fair Value | $ 99,600 | |
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 | $ 99,600 | |
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 | | |
Level 2 [Member] | Repurchase Agreements [Member] | Other Assets [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Fair Value | | |
Level 2 [Member] | Certificates of Deposit [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Adjusted Cost | $ 100,348 | |
Unrealized Gains (Losses) | (86) | |
Fair Value | $ 100,262 | |
Level 2 [Member] | Certificates of Deposit [Member] | Cash and Cash Equivalents [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Fair Value | | |
Level 2 [Member] | Certificates of Deposit [Member] | Short-Term Marketable Securities [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Fair Value | $ 100,262 | |
Level 2 [Member] | Certificates of Deposit [Member] | Other Assets [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Fair Value | | |
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[1] | The Company has established a non-qualified deferred compensation plan for certain members of management and all non-employee directors. The Company is informally funding its obligations under the deferred compensation plan by purchasing shares in various equity, bond and money market mutual funds that are held in a “Rabbi Trust” and are restricted for payment of obligations to plan participants. See Note 5 for additional information regarding the deferred compensation plan. |