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Cash Flow Information (Tables)
 12 Months Ended
Apr. 30, 2016
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 30,
2016
 
May 2,
2015
 
April 26,
2014
(Increase) decrease:
 
 
 
 
 
Restricted cash
$
298

 
$
18

 
$
(466
)
Account receivable
3,789

 
6,412

 
(18,293
)
Long-term receivables
2,851

 
3,234

 
3,027

Inventories
(5,100
)
 
(1,907
)
 
(12,771
)
Costs and estimated earnings in excess of billings
4,867

 
(1,667
)
 
5,955

Prepaid expenses and other current assets
1,290

 
(575
)
 
(536
)
Income taxes receivables
1,061

 
(3,084
)
 
(2,414
)
Advertising rights and other assets
(776
)
 
912

 
64

Increase (decrease):
 

 
 

 
 

Current marketing obligations and other payables
21

 
(146
)
 
372

Accounts payable
(9,926
)
 
5,594

 
6,701

Customer deposits (billed or collected)
(941
)
 
(1,315
)
 
4,931

Accrued expenses
476

 
2,860

 
165

Warranty obligations
4,726

 
(2,638
)
 
543

Billings in excess of costs and estimated earnings
(13,436
)
 
1,314

 
8,238

Long-term warranty obligations
(710
)
 
1,869

 
1,560

Income taxes payable
(40
)
 
(666
)
 
(527
)
Deferred revenue (billed or collected)
2,120

 
(250
)
 
(836
)
Long-term marketing obligations and other payables
(456
)
 
3,468

 
(501
)
 
$
(9,886
)
 
$
13,433

 
$
(4,788
)
Schedule of Supplemental Cash Flow Information
Supplemental disclosures of cash flow information consisted of the following:
 
Year Ended
 
April 30,
2016
 
May 2,
2015
 
April 26,
2014
Cash payments for:
 
 
 
 
 
Interest
$
303

 
$
289

 
$
198

Income taxes, net of refunds
(824
)
 
8,690

 
16,521
Schedule of Non-Cash Investing and Financing Activities
Supplemental schedule of non-cash investing and financing activities consisted of the following:
 
 
Year Ended
 
 
April 30,
2016
 
May 2,
2015
 
April 26,
2014
Demonstration equipment transferred to inventory
 
$
227

 
$
34

 
$
255

Purchases of property and equipment included in accounts payable
 
142

 
1,510

 
2,099

Contributions of common stock under the ESPP
 
1,777

 
2,512

 
1,552

Contingent consideration related to acquisition of ADFLOW
 
1,955

 
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