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Income Taxes - Reconciliation of Expected to Actual Income Tax Expense (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Jan. 31, 2016 | Oct. 31, 2015 | Jul. 31, 2015 | Apr. 30, 2015 | Jan. 31, 2015 | Oct. 31, 2014 | Jul. 31, 2014 | Apr. 30, 2014 | Jan. 31, 2016 | Jan. 31, 2015 | Jan. 31, 2014
Reconciliation of expected to actual income tax expense |  |  |  |  |  |  |  |  |  |  |
Federal income tax (benefit) expense at 34% |  |  |  |  |  |  |  |  | $ (9,436) | $ (3,463) | $ 2,049
Changes in tax rates |  |  |  |  |  |  |  |  | (82) |  | 22
Permanent differences |  |  |  |  |  |  |  |  | 509 | (224) | 132
Foreign effective tax rate differential |  |  |  |  |  |  |  |  | 1,609 | 540 | (1,884)
Potential tax, penalties and interest resulting from uncertain tax positions |  |  |  |  |  |  |  |  | (236) | (172) | 32
Foreign withholding taxes |  |  |  |  |  |  |  |  | 717 | 920 | 642
Election to deduct foreign taxes in prior years U.S. income tax returns |  |  |  |  |  |  |  |  | 2,610 |  |
Valuation allowance on deferred tax assets |  |  |  |  |  |  |  |  | 15,477 | 1,379 |
Other |  |  |  |  |  |  |  |  | (191) | 26 | 265
Income tax expense (benefit) | $ 14,675 | $ (746) | $ (2,797) | $ (155) | $ (1,484) | $ 57 | $ (676) | $ 1,109 | $ 10,977 | $ (994) | $ 1,258

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 + Details
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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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