Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Jul. 28, 2018	Apr. 28, 2018
Assets:
Cash equivalents	$ 2,134	$ 6,650
DPP receivable - receivables securitization program	63,786	0
DPP receivable - customer financing	106,412	150,404
Derivative instruments	1,470	1,613
Total assets	173,802	158,667
Liabilities:
Derivative instruments	1,470	1,613
Fair Value, Inputs, Level 1
Assets:
Cash equivalents	2,134	6,650
DPP receivable - receivables securitization program	0	0
DPP receivable - customer financing	0	0
Derivative instruments	0	0
Total assets	2,134	6,650
Liabilities:
Derivative instruments	0	0
Fair Value, Inputs, Level 2
Assets:
Cash equivalents	0	0
DPP receivable - receivables securitization program	0	0
DPP receivable - customer financing	0	0
Derivative instruments	1,470	1,613
Total assets	1,470	1,613
Liabilities:
Derivative instruments	1,470	1,613
Fair Value, Inputs, Level 3
Assets:
Cash equivalents	0	0
DPP receivable - receivables securitization program	63,786	0
DPP receivable - customer financing	106,412	150,404
Derivative instruments	0	0
Total assets	170,198	150,404
Liabilities:
Derivative instruments	$ 0	$ 0