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Income Per Share Information (Details) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jan. 31, 2017 | Jan. 31, 2016 | Oct. 31, 2016 | Sep. 05, 2012
Earnings Per Share [Abstract] |  |  |  |
Net income as reported | $ 70,416 | $ 73,180 | $ 382,095 |
Interest and costs attributable to 0.5% Exchangeable Senior Notes, net of income tax benefit | 384 | 389 |  |
Numerator for diluted earnings per share | $ 70,800 | $ 73,569 |  |
Basic weighted-average shares | 162,588 | 174,205 |  |
Common stock equivalents | 1,971 | 2,328 |  |
Shares attributable to 0.5% Exchangeable Senior Notes | 5,858 | 5,858 |  |
Diluted weighted-average shares | 170,417 | 182,391 |  |
Debt Instrument [Line Items] |  |  |  |
Shares issued under stock incentive and employee stock purchase plans | 1,280 | 473 |  |
0.5% Exchangeable Senior Notes Due 2032 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 0.50%
Restricted Stock Units RSU And Employee Stock Option Member [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Weighted-average number of antidilutive options and restricted stock units | 5,204 | 2,954 |  |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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