Stock Based Compensation (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Apr. 26, 2015	Apr. 27, 2014	Apr. 28, 2013
Restricted Stock
Restricted Stock
Outstanding at the beginning of the period (in shares)	553,684
Granted (in shares)	229,539
Vested (in shares)	(427,233)
Forfeited and expired (in shares)	(30,916)
Outstanding at the end of the period (in shares)	325,074
Weighted Average Grant-Date Fair Value
Outstanding at the beginning of the period (in dollars per share)	$ 7.33
Granted (in dollars per share)	$ 7.92
Vested (in dollars per share)	$ 7.58
Forfeited and expired (in dollars per share)	$ 6.86
Outstanding at the end of the period (in dollars per share)	$ 7.28
As of the end of the period
Weighted average remaining contractual term, Restricted Stock	8 months 12 days
Aggregate intrinsic value:
Outstanding, Restricted Stock	$ 4,858
Nonvested:
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options	784
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	8 months 12 days
Stock Options
Options
Outstanding at the beginning of the period (in shares)	957,860
Granted (in shares)	0	0	0
Exercised (in shares)	(10,000)
Forfeited and expired (in shares)	(542,800)
Outstanding at the end of the period (in shares)	405,060	957,860
Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 10.12
Exercised (in dollars per share)	$ 7.39
Forfeited and expired (in dollars per share)	$ 9.38
Outstanding at the end of the period (in dollars per share)	$ 11.18	$ 10.12
As of the end of the period
Outstanding exercisable options	405,060
Outstanding exercisable options, Weighted Average Exercise Price (in dollars per share)	$ 11.18
Weighted average remaining contractual term, Options	3 years
Aggregate intrinsic value:
Outstanding exercisable	2,185
Outstanding, Options	$ 2,185