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Gross Unrealized Losses and Fair Value of Marketable Securities (Detail) - USD ($) $ in Thousands	Jan. 31, 2018	Jan. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Fair Value	$ 191,198	$ 80,641
Less Than 12 Months, Unrealized Losses	(485)	(145)
Total, Fair Value	191,198	80,641
Total, Unrealized Losses	(485)	(145)
Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Fair Value	151,053	61,612
Less Than 12 Months, Unrealized Losses	(412)	(123)
Total, Fair Value	151,053	61,612
Total, Unrealized Losses	(412)	(123)
Municipal And Pre-Refunded Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Fair Value	39,671	18,713
Less Than 12 Months, Unrealized Losses	(63)	(21)
Total, Fair Value	39,671	18,713
Total, Unrealized Losses	(63)	(21)
Mutual Funds, Held in Rabbi Trust
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Fair Value	474	316
Less Than 12 Months, Unrealized Losses	(10)	(1)
Total, Fair Value	474	316
Total, Unrealized Losses	$ (10)	$ (1)

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- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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

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-Publisher FASB
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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