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Marketable Securities - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  |  | 3 Months Ended |  | 12 Months Ended
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Jan. 31, 2014 Securities | Jan. 31, 2013 Securities | Jan. 31, 2012 | Jan. 31, 2014 Long Term Investments | Jan. 31, 2013 Long Term Investments | Apr. 30, 2013 Auction Rate Securities | Jan. 31, 2013 Auction Rate Securities | Jan. 31, 2013 Auction Rate Securities Long Term Investments | Jan. 31, 2014 Other Expense Income Net | Jan. 31, 2013 Other Expense Income Net | Jan. 31, 2012 Other Expense Income Net
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale and maturities of available-for-sale securities | $ 451,866 | $ 207,576 | $ 414,769 |  |  |  |  |  |  |  |
Net realized gain (loss) |  |  |  |  |  |  |  |  | (101) | 248 | 1,171
Amortization of discounts and premiums, net | 10,932 | 5,276 | 7,373 |  |  |  |  |  |  |  |
Number of securities with unrealized loss positions | 219 | 342 |  |  |  |  |  |  |  |  |
Proceeds from sale of available-for-sale securities |  |  |  |  |  | 4,580 |  |  |  |  |
Amortized cost of available-for-sale securities | 647,483 | 378,393 |  | 365,809 | 150,107 |  |  | 4,925 |  |  |
Estimated fair value of available-for-sale securities | 648,235 | 378,071 |  | 366,422 | 149,585 |  | 4,330 | 4,330 |  |  |
12 Months or Greater, Unrealized Losses |  | $ 595 |  |  |  |  | $ 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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- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition The cash inflow associated with the sale or maturity (principal being due) of securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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