Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Apr. 25, 2020	Apr. 27, 2019
Assets:
Cash equivalents	$ 3,391	$ 19,529
Cash equivalents	117,327	57,238
DPP receivable - customer financing	228,019	121,657
Derivative instruments	204	380
Total assets	348,941	198,804
Liabilities:
Derivative instruments	19,849	3,194
Level 1
Assets:
Cash equivalents	3,391	19,529
Cash equivalents	0	0
DPP receivable - customer financing	0	0
Derivative instruments	0	0
Total assets	3,391	19,529
Liabilities:
Derivative instruments	0	0
Level 2
Assets:
Cash equivalents	0	0
Cash equivalents	0	0
DPP receivable - customer financing	0	0
Derivative instruments	204	380
Total assets	204	380
Liabilities:
Derivative instruments	19,849	3,194
Level 3
Assets:
Cash equivalents	0	0
Cash equivalents	117,327	57,238
DPP receivable - customer financing	228,019	121,657
Derivative instruments	0	0
Total assets	345,346	178,895
Liabilities:
Derivative instruments	$ 0	$ 0