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Revenue Recognition - Additional Information (Detail) - USD ($)	Jul. 31, 2018	May 01, 2018	Apr. 30, 2018
Revenue Recognition [Line Items]
Contract assets and liabilities	$ 1,757,000		$ 1,884,000
Contract liability recognized as revenue percentage	100.00%
ASU 2014-09 [Member]
Revenue Recognition [Line Items]
Cumulative effect adjustment to increase retained earnings		$ 217,000
Fiscal Year 2019 [Member]
Revenue Recognition [Line Items]
Contract liability recognized as revenue percentage	46.00%

X

- Definition

Amount of total contract liabilities for the obligation to transfer good or service to customer for which consideration as been received or is receivable, net of total contract assets for the right to consideration in exchange for good or service transferred to customer.

+ References

No definition available.

+ Details

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- Definition

Contract with customer, liability, revenue recognized percentage.

+ References

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- Definition

Revenue Recognition [Line Items]

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- Definition

Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 1
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