Stock-based Compensation - Director Awards (Details) - shares	3 Months Ended
Jul. 27, 2019	Jul. 28, 2018
Director \| 2014 Stock Plan \| RSAs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted in period (in shares)	30,000	24,000

Number of share instruments newly issued under a share-based compensation plan.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration