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Provision for Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jan. 31, 2015 | Jan. 31, 2014 | Jan. 31, 2015 | Jan. 31, 2014
Income Tax [Line Items] |  |  |  |
Effective income tax rate | 31.40%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 28.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 31.10%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 31.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Decreases in unrecognized tax benefits resulting from effective settlement |  |  | $ 4,506 tho_DecreasesInUnrecognizedTaxBenefitsResultingFromEffectiveSettlement |
Income tax benefit related to gross uncertain tax benefit releases, net |  |  | 2,387 tho_NetIncomeTaxBenefitRelatedToGrossUncertainTaxBenefitReleases |
Accrued an additional uncertain tax benefit related to prior tax periods | 90 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions |  | 90 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions |
Interest and penalties related to uncertain tax benefits | 147 tho_InterestAndPenaltiesRelatedToUncertainTaxBenefits |  | 293 tho_InterestAndPenaltiesRelatedToUncertainTaxBenefits |
Expected decrease in unrecognized tax benefits due to resolution of uncertain tax positions |  |  | 2,560 tho_IncreaseDecreaseInUnrecognizedTaxBenefits |
Expected decrease in interest and penalties due to resolution of uncertain tax positions |  |  | 385 tho_IncreaseDecreaseInInterestAndPenalties |
Minimum |  |  |  |
Income Tax [Line Items] |  |  |  |
Expected gross unrecognized tax benefits decrease |  |  | 100 tho_ExpectedGrossUnrecognizedTaxBenefitsDecrease / us-gaap_RangeAxis = us-gaap_MinimumMember |
Expected decrease in interest and penalties |  |  | 150 tho_ExpectedDecreaseInInterestAndPenalties / us-gaap_RangeAxis = us-gaap_MinimumMember |
Maximum |  |  |  |
Income Tax [Line Items] |  |  |  |
Expected gross unrecognized tax benefits decrease |  |  | 2,700 tho_ExpectedGrossUnrecognizedTaxBenefitsDecrease / us-gaap_RangeAxis = us-gaap_MaximumMember |
Expected decrease in interest and penalties |  |  | $ 1,200 tho_ExpectedDecreaseInInterestAndPenalties / us-gaap_RangeAxis = us-gaap_MaximumMember |

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