Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, with jurisdictional netting.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

Name:	us-gaap_DeferredIncomeTaxAssetsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Significant Accounting Policies - Narrative - Recently Adopted Accounting Pronouncements (Details) - USD ($) $ in Millions	Apr. 28, 2018	Apr. 30, 2017	Apr. 29, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred Income Tax Assets, Net	$ 24.0		$ 40.4
Accounting Standards Update 2016-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred Income Tax Assets, Net		$ 2.7