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Financial Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Jan. 31, 2019 | Jan. 31, 2018
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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 | $ 336,524 | $ 223,813
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 | 336,524 | 223,813
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 | 279,120 | 157,290
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 | 57,404 | 66,523
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 | 261,333 | 151,053
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 | 261,333 | 151,053
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 | 51,232 | 62,303
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 | 51,232 | 62,303
Fair Value, Measurements, Recurring | 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 | 8,062 |
Fair Value, Measurements, Recurring | Federal Government Agencies | 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 | 8,062 |
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 | 6,751 | 6,237
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 | 6,751 | 6,237
Fair Value, Measurements, Recurring | 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 | 3,193 | 4,220
Fair Value, Measurements, Recurring | Certificates of Deposit | 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 | 3,193 | $ 4,220
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 | 2,979 |
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 | 2,979 |
Fair Value, Measurements, Recurring | 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 | 2,974 |
Fair Value, Measurements, Recurring | Treasury Bills | 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 | $ 2,974 |

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