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Subsequent Events	6 Months Ended
	Oct. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	L. Subsequent Events On December 7, 2017, the Company experienced a criminal network cyber-attack that led to a disruption of its domestic operations, including manufacturing, engineering, administration, and sales operations. As of December 12, 2017 the Company had restored nearly all domestic operations. The Company has engaged third party experts, including a leading cybersecurity firm, to perform a forensic investigation of this attack. The Company has insurance coverage against recovery costs and business interruption resulting from cyber-attacks. However, the Company may have incurred, and may incur in the future, expenses and losses related to this attack that are not covered by insurance. The total amount of such expenses or losses, if any, cannot be estimated at this time.

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- Definition

The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-URI http://asc.fasb.org/topic&trid=2122774

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