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Cash Flow Information (Tables)
 12 Months Ended
Apr. 28, 2018
Supplemental Cash Flow Information [Abstract]  
Summary of Changes in Operating Assets and Liabilities
The changes in operating assets and liabilities consisted of the following:
 
Year Ended
 
April 28,
2018
 
April 29,
2017
 
April 30,
2016
(Increase) decrease:
 
 
 
 
 
Account receivable
$
2,266

 
$
(2,718
)
 
$
3,789

Long-term receivables
1,548

 
2,213

 
2,851

Inventories
(8,517
)
 
3,581

 
(5,100
)
Costs and estimated earnings in excess of billings
5,911

 
(6,203
)
 
4,867

Prepaid expenses and other current assets
(1,252
)
 
(980
)
 
1,290

Income taxes receivables
(4,747
)
 
4,201

 
1,061

Investment in affiliates and other assets
413

 
(611
)
 
(776
)
Increase (decrease):
 

 
 

 
 

Current marketing obligations and other payables
(358
)
 
857

 
21

Accounts payable
(2,573
)
 
5,544

 
(9,926
)
Customer deposits
(53
)
 
(1,514
)
 
(941
)
Accrued expenses
3,830

 
2,351

 
776

Warranty obligations
346

 
(2,986
)
 
4,726

Billings in excess of costs and estimated earnings
1,034

 
536

 
(13,436
)
Long-term warranty obligations
1,729

 
389

 
(710
)
Income taxes payable
(592
)
 
1,331

 
(37
)
Deferred revenue
2,499

 
1,256

 
2,120

Long-term marketing obligations and other payables
379

 
(43
)
 
(456
)
 
$
1,863

 
$
7,204

 
$
(9,881
)
Schedule of Supplemental Cash Flow Information
Supplemental disclosures of cash flow information consisted of the following:
 
Year Ended
 
April 28,
2018
 
April 29,
2017
 
April 30,
2016
Cash payments for:
 
 
 
 
 
Interest
$
193

 
$
228

 
$
303

Income taxes, net of refunds
8,937

 
3,196

 
(824
)
Schedule of Non-Cash Investing and Financing Activities
Supplemental schedule of non-cash investing and financing activities consisted of the following:
 
 
Year Ended
 
 
April 28,
2018
 
April 29,
2017
 
April 30,
2016
Demonstration equipment transferred to inventory
 
$
72

 
$
218

 
$
227

Purchases of property and equipment included in accounts payable
 
1,983

 
2,524

 
142

Contributions of common stock under the ESPP
 
1,682

 
840

 
1,777

Contingent consideration related to acquisition of ADFLOW
 
—

 
31

 
1,955