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Stock-Based Compensation - Restricted Shares and RSUs (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Jul. 25, 2015	Apr. 30, 2016	Apr. 25, 2015	Apr. 26, 2014
Stock-Based Compensation
Expense recognized		$ 9,647	$ 11,377	$ 14,475
Restricted Stock
Stock-Based Compensation
Percentage vesting each year from date of grant		25.00%
Period from grant date for first vesting		1 year
Vesting period		4 years
Unrecognized compensation cost		$ 3,300
Period for recognition of unrecognized compensation costs		2 years 10 months 24 days
Number of Shares
Non-vested at beginning of period (in shares)	142,000	142,000
Granted (in shares)		102,000
Vested (in shares)		(57,000)
Canceled (in shares)		(18,000)
Non-vested at end of period (in shares)		169,000	142,000
Weighted Average Grant Date Fair Value
Non-vested at beginning of period (in dollars per share)	$ 20.50	$ 20.50
Granted (in dollars per share/unit)	$ 26.69	26.46
Vested (in dollars per share)		16.07
Canceled (in dollars per share)		24.07
Non-vested at end of period (in dollars per share)		$ 25.22	$ 20.50
Restricted Stock | Employees
Number of Shares
Granted (in shares)		102,063
Restricted Stock | Selling, General and Administrative Expense
Stock-Based Compensation
Expense recognized		$ 1,100	$ 800	$ 500
Restricted Stock Units | Employees
Stock-Based Compensation
Fair value (in dollars per unit)		$ 25.87
Award common share equivalent (in shares)		1
Percentage vesting each year from date of grant		25.00%
Period from grant date for first vesting		1 year
Vesting period		4 years
Unrecognized compensation cost		$ 900
Period for recognition of unrecognized compensation costs		1 year
Number of Shares
Non-vested at beginning of period (in shares)	146,000	146,000
Vested (in shares)		(58,000)
Canceled (in shares)		(11,000)
Non-vested at end of period (in shares)		77,000	146,000
Weighted Average Grant Date Fair Value
Non-vested at beginning of period (in dollars per share)	$ 16.12	$ 16.12
Vested (in dollars per share)		15.40
Canceled (in dollars per share)		16.55
Non-vested at end of period (in dollars per share)		16.61	$ 16.12
Restricted Stock Units | Directors
Weighted Average Grant Date Fair Value
Granted (in dollars per share/unit)		$ 27.74	$ 21.81	$ 21.20
Restricted Stock Units | Directors | Maximum
Number of Shares
Granted (in shares)		100,000	100,000	100,000
Restricted Stock Units | Selling, General and Administrative Expense | Employees
Stock-Based Compensation
Expense recognized		$ 1,400	$ 1,500	$ 1,600
Restricted Stock Units | Selling, General and Administrative Expense | Directors
Stock-Based Compensation
Expense recognized		$ 600	$ 700	$ 700

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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).

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Per share weighted average intrinsic value of equity-based compensation awards not vested. Excludes stock and unit options.

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