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v2.4.1.9

Provision for Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Apr. 30, 2015 | Apr. 30, 2014 | Apr. 30, 2015 | Apr. 30, 2014
Income Tax [Line Items] |  |  |  |
Effective income tax rate | 32.80%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 33.40%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 31.90%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 32.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Decreases in unrecognized tax benefits resulting from effective settlement | $ 2,862 tho_DecreasesInUnrecognizedTaxBenefitsResultingFromEffectiveSettlement |  | $ 7,368 tho_DecreasesInUnrecognizedTaxBenefitsResultingFromEffectiveSettlement |
Income tax benefit related to gross uncertain tax benefit releases, net | 1,375 tho_NetIncomeTaxBenefitRelatedToGrossUncertainTaxBenefitReleases |  | 3,762 tho_NetIncomeTaxBenefitRelatedToGrossUncertainTaxBenefitReleases |
Accrued an additional uncertain tax benefit related to prior tax periods |  |  | 90 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions |
Interest and penalties related to uncertain tax benefits | 92 tho_InterestAndPenaltiesRelatedToUncertainTaxBenefits |  | 385 tho_InterestAndPenaltiesRelatedToUncertainTaxBenefits |
Expected decrease in unrecognized tax benefits due to resolution of uncertain tax positions |  |  | 3,640 tho_IncreaseDecreaseInUnrecognizedTaxBenefits |
Expected decrease in interest and penalties due to resolution of uncertain tax positions |  |  | 690 tho_IncreaseDecreaseInInterestAndPenalties |
Expected gross unrecognized tax benefits decrease |  |  | 540 tho_ExpectedGrossUnrecognizedTaxBenefitsDecrease |
Expected decrease in interest and penalties |  |  | $ 410 tho_ExpectedDecreaseInInterestAndPenalties |

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- Definition Percentage 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 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 2: 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 3: 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)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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