XML 85 R64.htm IDEA: XBRL DOCUMENT v3.19.2
Revenue from Contracts with Customers - Summary of the activity for deferred revenue (Detail)
$ in Thousands
12 Months Ended
Apr. 28, 2019
USD ($)
Revenue from Contract with Customer [Abstract]  
Beginning balance $ 809
Revenue recognized on contract liabilities during the period (2,725)
Payments received for services not yet rendered during the period 2,315
Ending balance $ 399