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Gross Unrealized Losses and Fair Value of Marketable Securities (Detail) (USD $) In Thousands, unless otherwise specified | Jan. 31, 2014 | Jan. 31, 2013
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Marketable Securities And Unrealized Loss Position [Line Items] |  |
Less Than 12 Months, Fair Value | $ 183,433 | $ 125,755
Less Than 12 Months, Unrealized Losses | (250) | (165)
12 Months or Greater, Fair Value |  | 5,987
12 Months or Greater, Unrealized Losses |  | (595)
Total, Fair Value | 183,433 | 131,742
Total, Unrealized Losses | (250) | (760)
Corporate Bonds |  |
Marketable Securities And Unrealized Loss Position [Line Items] |  |
Less Than 12 Months, Fair Value | 147,731 | 74,537
Less Than 12 Months, Unrealized Losses | (203) | (85)
Total, Fair Value | 147,731 | 74,537
Total, Unrealized Losses | (203) | (85)
Municipal And Pre-Refunded Municipal Bonds |  |
Marketable Securities And Unrealized Loss Position [Line Items] |  |
Less Than 12 Months, Fair Value | 6,291 | 42,826
Less Than 12 Months, Unrealized Losses | (10) | (77)
12 Months or Greater, Fair Value |  | 1,413
Total, Fair Value | 6,291 | 44,239
Total, Unrealized Losses | (10) | (77)
US Treasury Bill Securities |  |
Marketable Securities And Unrealized Loss Position [Line Items] |  |
Less Than 12 Months, Fair Value | 6,606 |
Total, Fair Value | 6,606 |
Certificates of Deposit |  |
Marketable Securities And Unrealized Loss Position [Line Items] |  |
Less Than 12 Months, Fair Value | 12,746 | 3,400
Less Than 12 Months, Unrealized Losses | (3) |
12 Months or Greater, Fair Value |  | 244
Total, Fair Value | 12,746 | 3,644
Total, Unrealized Losses | (3) |
Commercial Paper |  |
Marketable Securities And Unrealized Loss Position [Line Items] |  |
Less Than 12 Months, Fair Value | 6,640 | 2,994
Less Than 12 Months, Unrealized Losses | (1) | (1)
Total, Fair Value | 6,640 | 2,994
Total, Unrealized Losses | (1) | (1)
US Government Corporations and Agencies Securities |  |
Marketable Securities And Unrealized Loss Position [Line Items] |  |
Less Than 12 Months, Fair Value | 1,753 | 1,998
Less Than 12 Months, Unrealized Losses |  | (2)
Total, Fair Value | 1,753 | 1,998
Total, Unrealized Losses |  | (2)
Mutual funds, held in rabbi trust |  |
Marketable Securities And Unrealized Loss Position [Line Items] |  |
Less Than 12 Months, Fair Value | 1,666 |
Less Than 12 Months, Unrealized Losses | (33) |
Total, Fair Value | 1,666 |
Total, Unrealized Losses | (33) |
Auction Rate Securities |  |
Marketable Securities And Unrealized Loss Position [Line Items] |  |
12 Months or Greater, Fair Value |  | 4,330
12 Months or Greater, Unrealized Losses |  | (595)
Total, Fair Value |  | 4,330
Total, Unrealized Losses |  | $ (595)

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- Definition Amount of accumulated pre-tax unrealized loss on investments in available-for-sale securities that have been in a loss position for twelve months or longer impacting investments. + References No definition available. + Details
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