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Income Taxes - Additional Information (Detail) - USD ($) | 6 Months Ended
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Jan. 31, 2018 | Jan. 31, 2017
Income Tax Contingency [Line Items] |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 26.90% | 35.00%
Federal Statutory Income Tax Rate, Percent | 21.00% |
Provisional Income Tax Expense Resulting from Changes in Tax Legislation (repatriation) | $ 402 |
Provisional Income Tax Expense Resulting from Changes in Tax Legislation (net of other disclosures) | 18,832 |
Provisional Income Tax Expense Resulting from Changes in Tax Legislation (APB 23) | $ 1,826 |

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- Definition Provisional Income Tax Expense Resulting from Changes in Tax Legislation (APB 23) + References No definition available. + Details
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- Definition Provisional Income Tax Expense Resulting from Changes in Tax Legislation (net of other disclosures) + References No definition available. + Details
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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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