Discontinued Operations (Tables)

12 Months Ended

Apr. 30, 2019

Discontinued Operations and Disposal Groups [Abstract]

Schedule of statements of operations data for the EES Business

	Year Ended April 30,
	2019		2018		2017
Net sales	$	4,256	$	38,411	$	36,201
Cost of sales		5,097		33,384		29,983
Gross margin		(841)		5,027		6,218
Selling, general and administrative		1,515		7,825		8,895
Research and development		1,072		3,526		4,577
Other income, net		1		(27)		7
Loss from discontinued operations before income taxes		(3,427)		(6,351)		(7,247)
Benefit for income taxes		(463)		(2,464)		(2,646)
Net loss from discontinued operations	$	(2,964)	$	(3,887)	$	(4,601)
Gain on sale of business, net of tax expense of $2,444 for the year ended April 30, 2019		8,490		—		—
Net income (loss) from discontinued operations	$	5,526	$	(3,887)	$	(4,601)

Major classes of assets and liabilities

	April 30,
	2019		2018
Carrying amount of assets classified as discontinued operations
Current assets:
Accounts receivable, net of allowance for doubtful accounts of $139 at April 30, 2018	$	—	$	6,889
Inventories, net		—		15,494
Prepaid expenses and other current assets		—		185
Property and equipment, net		—		3,100
Total current assets classified as discontinued operations		—		25,668
Property and equipment, net		—		—
Total non-current assets classified as discontinued operations		—		—
Total assets classified as discontinued operations	$	—	$	25,668
Carrying amount of liabilities classified as discontinued operations
Current liabilities:
Accounts payable	$	—	$	5,121
Wages and related accruals		—		1,946
Customer advances		—		1,028
Other current liabilities		—		1,199
Total current liabilities		—		9,294
Total liabilities classified as discontinued operations	$	—	$	9,294