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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, 2018 | Oct. 31, 2017 | Jul. 31, 2017 | Apr. 30, 2017 | Jan. 31, 2017 | Oct. 31, 2016 | Jul. 31, 2016 | Apr. 30, 2016 | Jan. 31, 2018 | Jan. 31, 2017 | Jan. 31, 2016
Reconciliation of expected to actual income tax expense |  |  |  |  |  |  |  |  |  |  |
Federal income tax at 32.9%, 34%, 34%, respectively |  |  |  |  |  |  |  |  | $ (6,632) | $ (10,655) | $ (9,436)
Federal income tax expense |  |  |  |  |  |  |  |  | 32.90% | 34.00% | 34.00%
Changes in tax rates |  |  |  |  |  |  |  |  | $ 7,257 | $ 0 | $ (82)
Permanent differences |  |  |  |  |  |  |  |  | 3,356 | 38 | 509
Foreign effective tax rate differential |  |  |  |  |  |  |  |  | 1,163 | 1,979 | 1,609
Potential tax, penalties and interest resulting from uncertain tax positions |  |  |  |  |  |  |  |  | 0 | 0 | (236)
Foreign withholding taxes, foreign branch taxes, including penalties and interest |  |  |  |  |  |  |  |  | 716 | 671 | 717
Election to deduct foreign taxes in prior years U.S. income tax returns |  |  |  |  |  |  |  |  | 0 | 0 | 2,610
Valuation allowance on deferred tax assets |  |  |  |  |  |  |  |  | (5,765) | 10,056 | 15,477
Excess tax deficiency for share-based payments under ASU 2016-09 |  |  |  |  |  |  |  |  | 309 | 0 | 0
Other |  |  |  |  |  |  |  |  | 506 | (275) | (191)
Income tax expense | $ (262) | $ 586 | $ 357 | $ 229 | $ 1,308 | $ (228) | $ 435 | $ 299 | $ 910 | $ 1,814 | $ 10,977

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + 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=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: 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=84230637&loc=d3e32698-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. + 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=84230637&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=84230637&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32123-109318 + Details
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