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Shareholders' Equity - Summary of Stock Option Activity and Related Information for Stock Options Granted (Details) - $ / shares	12 Months Ended
	May. 02, 2015	May. 03, 2014	Apr. 27, 2013	Apr. 28, 2012
2010 Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Awarded (in shares)	108,000	120,000	120,000
2010 Stock Plan | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding - beginning balance (in shares)	420,001	360,000	240,000
Awarded (in shares)	108,000	120,000	120,000
Exercised (in shares)	(285,334)	(59,999)	0
Cancelled (in shares)	0	0	0
Outstanding - ending balance (in shares)	242,667	420,001	360,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Wtd. Avg. Exercise Price, Outstanding - beginning balance (in dollars per share)	$ 11.74	$ 9.53	$ 9.97
Wtd. Avg. Exercise Price, Awarded (in dollars per share)	37.01	17.27	8.64
Wtd. Avg. Exercise Price, Exercised (in dollars per share)	10.47	9.50	0.00
Wtd. Avg. Exercise Price, Cancelled (in dollars per share)	0.00	0.00	0.00
Wtd. Avg. Exercise Price, Outstanding - ending balance (in dollars per share)	$ 24.49	$ 11.74	$ 9.53
2007 Stock Plan | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding - beginning balance (in shares)	172,359	778,000	738,000
Awarded (in shares)	50,500	42,500	42,500
Exercised (in shares)	(114,859)	(648,141)	(2,500)
Cancelled (in shares)		0
Outstanding - ending balance (in shares)	108,000	172,359	778,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Wtd. Avg. Exercise Price, Outstanding - beginning balance (in dollars per share)	$ 10.02	$ 5.94	$ 5.79
Wtd. Avg. Exercise Price, Awarded (in dollars per share)	37.01	17.27	8.64
Wtd. Avg. Exercise Price, Exercised (in dollars per share)	8.55	5.60	8.10
Wtd. Avg. Exercise Price, Cancelled (in dollars per share)		0.00
Wtd. Avg. Exercise Price, Outstanding - ending balance (in dollars per share)	$ 24.21	$ 10.02	$ 5.94
2000 and 2004 Stock Plans | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding - beginning balance (in shares)	0	72,585	251,365
Awarded (in shares)		0	0
Exercised (in shares)		(71,175)	(50,675)
Cancelled (in shares)		(1,410)	(128,105)
Outstanding - ending balance (in shares)		0	72,585
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Wtd. Avg. Exercise Price, Outstanding - beginning balance (in dollars per share)	$ 0.00	$ 11.44	$ 10.96
Wtd. Avg. Exercise Price, Awarded (in dollars per share)		0.00	0.00
Wtd. Avg. Exercise Price, Exercised (in dollars per share)		11.44	11.44
Wtd. Avg. Exercise Price, Cancelled (in dollars per share)		11.44	10.50
Wtd. Avg. Exercise Price, Outstanding - ending balance (in dollars per share)		$ 0.00	$ 11.44
Exercisable options (in shares)		0	72,585	251,365
Wtd. Avg. Exercise Price - Exercisable options (in dollars per share)		$ 0.00	$ 11.44	$ 10.96

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- Definition

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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