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Financial Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Jul. 31, 2021 | Jan. 31, 2021 | Jul. 31, 2020
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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 | $ 270,231 | $ 298,357 | $ 9,717
Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial assets accounted for at fair value on a recurring basis | 270,231 | 298,357 | 9,717
Fair Value, Measurements, Recurring | 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 | 11,711 | 10,793 | 9,717
Fair Value, Measurements, Recurring | 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 | 258,520 | 287,564 |
Fair Value, Measurements, Recurring | 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 | 90,277 | 98,412 | 321
Fair Value, Measurements, Recurring | Corporate Bonds | 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 |  |  | 321
Fair Value, Measurements, Recurring | Corporate Bonds | 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 | 90,277 | 98,412 |
Fair Value, Measurements, Recurring | 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 | 162,147 | 180,160 | 264
Fair Value, Measurements, Recurring | Municipal And Pre-Refunded Municipal Bonds | 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 |  |  | 264
Fair Value, Measurements, Recurring | Municipal And Pre-Refunded Municipal Bonds | 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 | 162,147 | 180,160 |
Fair Value, Measurements, Recurring | 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 | 11,711 | 10,793 | 9,132
Fair Value, Measurements, Recurring | Mutual Funds, Held in Rabbi Trust | 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 | 11,711 | 10,793 | $ 9,132
Fair Value, Measurements, Recurring | 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 | 6,096 | 8,992 |
Fair Value, Measurements, Recurring | Commercial Paper | 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 | $ 6,096 | $ 8,992 |

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