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Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Loss (Tables) | 6 Months Ended
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Jul. 31, 2018
Equity [Abstract] |
Changes in Accumulated Other Comprehensive Loss by Component, Net of Tax | The following tables present the changes in “Accumulated other comprehensive loss,” by component, net of tax, for the three and six months ended July 31, 2018 and 2017:
|  | Three Months Ended July 31, 2018 |  |  | Six Months Ended July 31, 2018 |
|  |  |  |  |  | Unrealized Gains |  |  |  |  |  |  |  |  |  |  | Unrealized Gains |  |  |  |  |
|  | Foreign |  |  | and (Losses) on |  |  |  |  |  |  | Foreign |  |  | and (Losses) on |  |  |  |  |
|  | Currency |  |  | Available-for- |  |  |  |  |  |  | Currency |  |  | Available-for- |  |  |  |  |
|  | Translation |  |  | Sale Securities |  |  | Total |  |  | Translation |  |  | Sale Securities |  |  | Total |
Balance at beginning of period |  | $ | (18,309 | ) |  | $ | (404 | ) |  | $ | (18,713 | ) |  | $ | (10,340 | ) |  | $ | (311 | ) |  | $ | (10,651 | )
Other comprehensive income (loss) before reclassifications |  |  | (7,881 | ) |  |  | (7 | ) |  |  | (7,888 | ) |  |  | (15,850 | ) |  |  | (87 | ) |  |  | (15,937 | )
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (13 | ) |  |  | (13 | )
Net current-period other comprehensive income (loss) |  |  | (7,881 | ) |  |  | (7 | ) |  |  | (7,888 | ) |  |  | (15,850 | ) |  |  | (100 | ) |  |  | (15,950 | )
Balance at end of period |  | $ | (26,190 | ) |  | $ | (411 | ) |  | $ | (26,601 | ) |  | $ | (26,190 | ) |  | $ | (411 | ) |  | $ | (26,601 | )
|  | Three Months Ended July 31, 2017 |  |  | Six Months Ended July 31, 2017 |
|  |  |  |  |  | Unrealized Gains |  |  |  |  |  |  |  |  |  |  | Unrealized Gains |  |  |  |  |
|  | Foreign |  |  | and (Losses) on |  |  |  |  |  |  | Foreign |  |  | and (Losses) on |  |  |  |  |
|  | Currency |  |  | Available-for- |  |  |  |  |  |  | Currency |  |  | Available-for- |  |  |  |  |
|  | Translation |  |  | Sale Securities |  |  | Total |  |  | Translation |  |  | Sale Securities |  |  | Total |
Balance at beginning of period |  | $ | (32,224 | ) |  | $ | (45 | ) |  | $ | (32,269 | ) |  | $ | (34,012 | ) |  | $ | (57 | ) |  | $ | (34,069 | )
Other comprehensive income (loss) before reclassifications |  |  | 8,942 |  |  |  | 7 |  |  |  | 8,949 |  |  |  | 10,730 |  |  |  | 5 |  |  |  | 10,735 |
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | — |  |  |  | (23 | ) |  |  | (23 | ) |  |  | — |  |  |  | (9 | ) |  |  | (9 | )
Net current-period other comprehensive income (loss) |  |  | 8,942 |  |  |  | (16 | ) |  |  | 8,926 |  |  |  | 10,730 |  |  |  | (4 | ) |  |  | 10,726 |
Balance at end of period |  | $ | (23,282 | ) |  | $ | (61 | ) |  | $ | (23,343 | ) |  | $ | (23,282 | ) |  | $ | (61 | ) |  | $ | (23,343 | )

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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