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Cash Flow Information
 12 Months Ended
Apr. 27, 2019
Supplemental Cash Flow Information [Abstract]  
Cash Flow Information
Note 15. Cash Flow Information

The changes in operating assets and liabilities consisted of the following:
 
Year Ended
 
April 27,
2019
 
April 28,
2018
 
April 29,
2017
(Increase) decrease:
 
 
 
 
 
Account receivable
$
10,856

 
$
2,266

 
$
(2,718
)
Long-term receivables
329

 
1,548

 
2,213

Inventories
(4,076
)
 
(8,517
)
 
3,581

Contract assets
(3,040
)
 
5,911

 
(6,203
)
Prepaid expenses and other current assets
472

 
(1,252
)
 
(980
)
Income taxes receivables
4,250

 
(4,747
)
 
4,201

Investment in affiliates and other assets
48

 
413

 
(611
)
Increase (decrease):
 

 
 

 
 

Accounts payable
(2,747
)
 
(2,573
)
 
5,544

Contract liabilities
10,774

 
3,480

 
278

Accrued expenses
4,631

 
3,472

 
3,208

Warranty obligations
(4,393
)
 
346

 
(2,986
)
Long-term warranty obligations
(1,079
)
 
1,729

 
389

Income taxes payable
(3,023
)
 
(592
)
 
1,331

Long-term marketing obligations and other payables
(1,116
)
 
379

 
(43
)
 
$
11,886

 
$
1,863

 
$
7,204



Supplemental disclosures of cash flow information consisted of the following:
 
Year Ended
 
April 27,
2019
 
April 28,
2018
 
April 29,
2017
Cash payments for:
 
 
 
 
 
Interest
$
177

 
$
193

 
$
228

Income taxes, net of refunds
(1,934
)
 
8,937

 
3,196



Supplemental schedule of non-cash investing and financing activities consisted of the following:
 
 
Year Ended
 
 
April 27,
2019
 
April 28,
2018
 
April 29,
2017
Demonstration equipment transferred to inventory
 
$
97

 
$
72

 
$
218

Purchases of property and equipment included in accounts payable
 
1,106

 
1,983

 
2,524

Contributions of common stock under the ESPP
 
1,650

 
1,682

 
840

Contingent consideration related to acquisition
 
—

 
—

 
31