Shareholders' Equity - Summary of Restricted Stock Awards and Restricted Stock Units Activity (Details) - shares	12 Months Ended
	Apr. 29, 2017	Apr. 30, 2016	May 02, 2015	Apr. 28, 2012	Apr. 30, 2011
2014 Incentive Plan | RSAs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested and unissued - beginning balance (in shares)	1,161,000	0	0
Awarded (in shares)	99,000	1,185,000	13,500
Vested (in shares)	(27,000)	(24,000)	(13,500)
Forfeited and cancelled (in shares)	(64,500)	0	0
Unvested and unissued - ending balance (in shares)	1,168,500	1,161,000	0
2014 Incentive Plan | RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested and unissued - beginning balance (in shares)	576,000	0	0
Awarded (in shares)	32,000	576,000	0
Vested (in shares)	(11,333)	0	0
Forfeited and cancelled (in shares)	(28,667)	0	0
Unvested and unissued - ending balance (in shares)	568,000	576,000	0
2010 Stock Plan | RSAs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested and unissued - beginning balance (in shares)	33,334	66,667	700,000
Awarded (in shares)	0	0	0	100,000	640,000
Vested (in shares)	(33,334)	(33,333)	(633,333)
Forfeited and cancelled (in shares)	0	0	0
Unvested and unissued - ending balance (in shares)	0	33,334	66,667
2010 Stock Plan | RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested and unissued - beginning balance (in shares)	0	0	60,000
Awarded (in shares)	0	0	0		320,000
Vested (in shares)	0	0	(60,000)
Forfeited and cancelled (in shares)	0	0	0
Unvested and unissued - ending balance (in shares)	0	0	0
2007 Stock Plan | RSAs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested and unissued - beginning balance (in shares)		0	0
Awarded (in shares)			13,500
Vested (in shares)			(13,500)
Forfeited and cancelled (in shares)			0
Unvested and unissued - ending balance (in shares)			0