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Shareholders' Equity - Schedule of Restricted Stock Awards and Restricted Stock Units by Grant Year and Vesting Period (Details) - 2014 Incentive Plan - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Apr. 30, 2016	May 02, 2015	Jul. 15, 2014
RSAs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awarded (in shares)	1,185,000	13,500
RSAs | Five-year RSA cliff, performance-based
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awarded (in shares)	774,000
Weighted average value (in dollars per share)	$ 31.98
Unearned compensation expense	$ 21.9
RSAs | Five-year RSA cliff, performance-based | Target
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unearned compensation expense	$ 21.9
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awarded (in shares)	576,000	0
Unearned compensation expense			$ 18.4
RSUs | Five-year RSU, 30% in fiscal 2018, 30% in fiscal 2019 and 40% in fiscal 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awarded (in shares)	576,000
Weighted average value (in dollars per share)	$ 32.02
Unearned compensation expense	$ 15.6
RSUs | Five-year RSU, 30% in fiscal 2018, 30% in fiscal 2019 and 40% in fiscal 2020 | Target
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unearned compensation expense	$ 15.6

X

- Definition

Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

+ References

No definition available.

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

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