Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Apr. 27, 2019	Apr. 28, 2018
Assets:
Cash equivalents	$ 19,529	$ 6,650
Cash equivalents	57,238	0
DPP receivable - customer financing	121,657	150,404
Derivative instruments	380	1,613
Total assets	198,804	158,667
Liabilities:
Derivative instruments	3,194	1,613
Level 1
Assets:
Cash equivalents	19,529	6,650
Cash equivalents	0	0
DPP receivable - customer financing	0	0
Derivative instruments	0	0
Total assets	19,529	6,650
Liabilities:
Derivative instruments	0	0
Level 2
Assets:
Cash equivalents	0	0
Cash equivalents	0	0
DPP receivable - customer financing	0	0
Derivative instruments	380	1,613
Total assets	380	1,613
Liabilities:
Derivative instruments	3,194	1,613
Level 3
Assets:
Cash equivalents	0	0
Cash equivalents	57,238	0
DPP receivable - customer financing	121,657	150,404
Derivative instruments	0	0
Total assets	178,895	150,404
Liabilities:
Derivative instruments	$ 0	$ 0