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Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Jul. 31, 2013 | Jul. 31, 2012 | Jul. 31, 2011
Income Tax [Line Items] |  |  |
Capital loss carry forward expected to be realized prior to expiration | $ 69 |  |
Capital loss carry forward expiration year | 2014 |  |
Tax credit carry forward | 547 |  |
Unrecognized tax benefits that, if recognized, would affect the company's income tax rate | 21,765 | 22,454 | 21,453
Total amount of liabilities accrued for interest and penalties related to unrecognized tax benefits | 11,671 | 13,265 | 12,533
Total amount of interest and penalties expense (benefit) recognized | (932) | 503 | (995)
Expected decrease in unrecognized tax benefits due to resolution of uncertain tax positions | (4,000) |  |
Expected decrease in interest due to resolution of uncertain tax positions | (1,000) |  |
Expected decrease in penalties due to resolution of uncertain tax positions | (60) |  |
Minimum |  |  |
Income Tax [Line Items] |  |  |
Gross decrease in unrecognized tax benefit | (2,600) |  |
Decrease in interest and penalties | (1,300) |  |
Maximum |  |  |
Income Tax [Line Items] |  |  |
Gross decrease in unrecognized tax benefit | (9,700) |  |
Decrease in interest and penalties | (3,800) |  |
State and Local Jurisdiction |  |  |
Income Tax [Line Items] |  |  |
Tax credit carry forward | 1,282 |  |
Gross state tax Net Operating Loss carry forwards | 66,000 |  |
Deferred tax asset, Net Operating Loss carry forwards | 1,375 |  |
State and Local Jurisdiction | Minimum |  |  |
Income Tax [Line Items] |  |  |
Capital loss carry forward expiration year | 2022 |  |
Gross state tax Net Operating Loss carry forwards, expiration year | 2014 |  |
State and Local Jurisdiction | Maximum |  |  |
Income Tax [Line Items] |  |  |
Capital loss carry forward expiration year | 2023 |  |
Gross state tax Net Operating Loss carry forwards, expiration year | 2033 |  |
Idaho |  |  |
Income Tax [Line Items] |  |  |
Tax and interest paid to finalize tax audit for tax years ended July 31, 2009 through 2011 | $ 70 |  |

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- Definition This element represents the total of interest expense recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties in the period in which the entity claims or expects to claim a tax position, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 15, 16 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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