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Fair Value Measurement - Additional Information (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2017 | Jul. 31, 2017 | Apr. 30, 2018 | Apr. 30, 2017 | Jul. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Reduction in fair value of contingent consideration liability |  | $ 1,300,000 |  |  |
Ultimate Survival Technologies, Inc. |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Contingent consideration payable upon financial performance of acquired business |  |  |  | $ 1,700,000 |
Business combination, contingent consideration payable performance period |  |  |  | 2 years |
Reduction in fair value of contingent consideration liability |  |  | $ 1,600,000 |  |
Business combination contingent consideration liability non-current |  |  |  |  | $ 60,000
Ultimate Survival Technologies, Inc. | Maximum |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Contingent consideration payable upon financial performance of acquired business |  |  |  | $ 2,000,000 |
Gemini Technologies, Incorporated |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Business combination, contingent consideration payable performance period | 3 years |  |  |  |
Business combination contingent consideration liability non-current |  |  |  |  | 100,000
Contingent consideration maximum payout | $ 17,100,000 |  |  |  |
(Level 1) | Fair Value on Recurring Basis |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and cash equivalents |  |  | $ 48,900,000 |  | $ 25,200,000

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- Definition Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479 + Details
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- Definition For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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