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Financial Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Jul. 31, 2015 | Jan. 31, 2015 | Jul. 31, 2014
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial assets accounted for at fair value on a recurring basis | $ 144,690 | $ 208,694 | $ 263,867
Corporate Bonds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial assets accounted for at fair value on a recurring basis | 55,699 | 103,326 | 148,923
Municipal And Pre-Refunded Municipal Bonds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial assets accounted for at fair value on a recurring basis | 77,534 | 73,495 | 74,526
Certificates of Deposit |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial assets accounted for at fair value on a recurring basis | 6,435 | 14,198 | 16,850
Treasury Bills |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial assets accounted for at fair value on a recurring basis |  | 9,156 | 15,803
Commercial Paper |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial assets accounted for at fair value on a recurring basis |  | 3,940 | 2,896
Mutual Funds, Held in Rabbi Trust |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial assets accounted for at fair value on a recurring basis | 5,022 | 3,778 | 3,089
Federal Government Agencies |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial assets accounted for at fair value on a recurring basis |  | 801 | 1,780
Fair Value, Inputs, Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial assets accounted for at fair value on a recurring basis | 60,721 | 117,061 | 169,595
Fair Value, Inputs, Level 1 | Corporate Bonds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial assets accounted for at fair value on a recurring basis | 55,699 | 103,326 | 148,923
Fair Value, Inputs, Level 1 | Treasury Bills |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial assets accounted for at fair value on a recurring basis |  | 9,156 | 15,803
Fair Value, Inputs, Level 1 | Mutual Funds, Held in Rabbi Trust |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial assets accounted for at fair value on a recurring basis | 5,022 | 3,778 | 3,089
Fair Value, Inputs, Level 1 | Federal Government Agencies |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial assets accounted for at fair value on a recurring basis |  | 801 | 1,780
Fair Value, Inputs, Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial assets accounted for at fair value on a recurring basis | 83,969 | 91,633 | 94,272
Fair Value, Inputs, Level 2 | Municipal And Pre-Refunded Municipal Bonds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial assets accounted for at fair value on a recurring basis | 77,534 | 73,495 | 74,526
Fair Value, Inputs, Level 2 | Certificates of Deposit |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial assets accounted for at fair value on a recurring basis | $ 6,435 | 14,198 | 16,850
Fair Value, Inputs, Level 2 | Commercial Paper |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial assets accounted for at fair value on a recurring basis |  | $ 3,940 | $ 2,896

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