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Gross Unrealized Losses and Fair Value of Marketable Securities (Detail) - USD ($) $ in Thousands	Jan. 31, 2016	Jan. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Fair Value	$ 36,105	$ 66,181
Less Than 12 Months, Unrealized Losses	(303)	(125)
12 Months or Greater, Fair Value	1,532	383
12 Months or Greater, Unrealized Losses	(6)	(1)
Total, Fair Value	37,637	66,564
Total, Unrealized Losses	(309)	(126)
Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Fair Value	30,745	55,384
Less Than 12 Months, Unrealized Losses	(54)	(63)
12 Months or Greater, Fair Value	1,098	383
12 Months or Greater, Unrealized Losses	(6)	(1)
Total, Fair Value	31,843	55,767
Total, Unrealized Losses	(60)	(64)
Municipal And Pre-Refunded Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Fair Value	997	4,672
Less Than 12 Months, Unrealized Losses	(2)	(8)
12 Months or Greater, Fair Value	434
Total, Fair Value	1,431	4,672
Total, Unrealized Losses	(2)	(8)
Mutual Funds, Held in Rabbi Trust
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Fair Value	4,363	3,778
Less Than 12 Months, Unrealized Losses	(247)	(54)
Total, Fair Value	4,363	3,778
Total, Unrealized Losses	$ (247)	(54)
Certificates of Deposit
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Fair Value		1,600
Total, Fair Value		1,600
Commercial Paper
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Fair Value		747
Total, Fair Value		$ 747

X

- Definition

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 twelve months or longer.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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