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Shareholders' Equity - Summary of Stock Option Activity and Related Information for Stock Options Granted (Details) - Stock Options - $ / shares	12 Months Ended
	Apr. 28, 2018	Apr. 29, 2017	Apr. 30, 2016
2010 Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding - beginning balance (in shares)	72,000	197,332	242,667
Awarded (in shares)	0	0	0
Exercised (in shares)	0	(125,332)	(18,668)
Cancelled (in shares)	0	0	(26,667)
Outstanding - ending balance (in shares)	72,000	72,000	197,332
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)	$ 37.01	$ 24.55	$ 24.50
Wtd. Avg. Exercise Price, Awarded (in dollars per share)	0	0	0.00
Wtd. Avg. Exercise Price, Exercised (in dollars per share)	0.00	17.40	12.96
Wtd. Avg. Exercise Price, Cancelled (in dollars per share)	0.00	0.00	32.07
Wtd. Avg. Exercise Price, Outstanding - ending balance (in dollars per share)	$ 37.01	$ 37.01	$ 24.55
2007 Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding - beginning balance (in shares)	57,169	79,666	108,000
Awarded (in shares)	0	0	0
Exercised (in shares)	(13,333)	(22,497)	(28,334)
Cancelled (in shares)	(1,668)	0	0
Outstanding - ending balance (in shares)	42,168	57,169	79,666
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)	$ 31.82	$ 28.91	$ 24.21
Wtd. Avg. Exercise Price, Awarded (in dollars per share)	0.00	0.00	0.00
Wtd. Avg. Exercise Price, Exercised (in dollars per share)	24.67	21.52	10.99
Wtd. Avg. Exercise Price, Cancelled (in dollars per share)	37.01	0.00	0.00
Wtd. Avg. Exercise Price, Outstanding - ending balance (in dollars per share)	$ 33.87	$ 31.82	$ 28.91

X

- 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.

+ 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)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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

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Number of options outstanding, including both vested and non-vested options.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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-Publisher FASB
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-Topic 718
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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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