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Discontinued Operations - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 0 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 21, 2013 | Jan. 31, 2015 | Jan. 31, 2014 | Oct. 31, 2013 | Jan. 31, 2015 | Jan. 31, 2014 | Jul. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Proceeds from sale of bus business | $ 100,000 us-gaap_ProceedsFromDivestitureOfBusinesses |  |  |  |  | $ 100,000 us-gaap_ProceedsFromDivestitureOfBusinesses | $ 105,043 us-gaap_ProceedsFromDivestitureOfBusinesses
Discontinued operation, amounts collected from ASV |  |  |  |  |  |  | 5,043 tho_AmountCollectedFromPurchaserOfBusBusinessDueToNetAssetIncrease
Pre-tax gain (loss) on sale of business |  |  | (746)us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax | 7,825 us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax |  | 7,079 us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax | 7,079 us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
Impact of indemnification to tax expenses |  |  | 1,883 tho_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccruedSubjectToIndemnification |  |  | 1,883 tho_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccruedSubjectToIndemnification |
Income tax benefit (expense) |  | $ 945 us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation | $ 851 us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation |  | $ 1,104 us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation | $ 1,173 us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation |

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- Definition Amount collected from purchaser of bus business due to net asset increase + References No definition available. + Details
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- Definition Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued Subject To Indemnification + References No definition available. + Details
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- Definition Amount of gain (loss), before tax expense or benefit and not previously recognized, resulting from the sale of a business component. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition Tax effect allocated to a disposal group that is classified as a component of the entity reported as a separate component of income before extraordinary items. Includes the tax effects of the following: income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b),(c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32672-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=18498875&loc=d3e38679-109324 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 + Details
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- Definition The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period. + 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 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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