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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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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
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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.

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Amount of liability recognized arising from contingent consideration in a business combination.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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