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Gross Unrealized Losses and Fair Value of Marketable Securities (Detail) - USD ($) $ in Thousands | Jan. 31, 2019 | Jan. 31, 2018
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | $ 204,953 | $ 191,198
Less Than 12 Months, Unrealized Losses | (175) | (485)
12 Months or Greater, Fair Value | 43,108 |
12 Months or Greater, Unrealized Losses | (125) |
Total, Fair Value | 248,061 | 191,198
Total, Unrealized Losses | (300) | (485)
Corporate Bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 177,932 | 151,053
Less Than 12 Months, Unrealized Losses | (160) | (412)
12 Months or Greater, Fair Value | 38,201 |
12 Months or Greater, Unrealized Losses | (117) |
Total, Fair Value | 216,133 | 151,053
Total, Unrealized Losses | (277) | (412)
Municipal And Pre-Refunded Municipal Bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 20,732 | 39,671
Less Than 12 Months, Unrealized Losses | (13) | (63)
12 Months or Greater, Fair Value | 4,907 |
12 Months or Greater, Unrealized Losses | (8) |
Total, Fair Value | 25,639 | 39,671
Total, Unrealized Losses | (21) | (63)
Federal Government Agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 3,315 |
Less Than 12 Months, Unrealized Losses | (1) |
Total, Fair Value | 3,315 |
Total, Unrealized Losses | (1) |
Treasury Bills |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 2,974 |
Less Than 12 Months, Unrealized Losses | (1) |
Total, Fair Value | 2,974 |
Total, Unrealized Losses | $ (1) |
Mutual Funds, Held in Rabbi Trust |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value |  | 474
Less Than 12 Months, Unrealized Losses |  | (10)
Total, Fair Value |  | 474
Total, Unrealized Losses |  | $ (10)

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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