Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Jul. 28, 2013	Jul. 29, 2012
Income (loss) applicable to common shares:
Income (loss) from continuing operations	$ (4,862)	$ 4,744
Income from discontinued operations		1,917
Net income (loss)	$ (4,862)	$ 6,661
Denominator:
Denominator for basic earnings (loss) per share - weighted average shares	39,582,928	39,018,281
Effect of dilutive securities Employee stock options (in shares)		16,999
Denominator for diluted earnings (loss) per share - adjusted weighted average shares and assumed conversions	39,582,928	39,035,280
Basic earnings (loss) per share:
Income (loss) from continuing operations (in dollars per share)	$ (0.12)	$ 0.12
Income from discontinued operations (in dollars per share)		$ 0.05
Net income (loss) (in dollars per share)	$ (0.12)	$ 0.17
Diluted earnings (loss) per share:
Income (loss) from continuing operations (in dollars per share)	$ (0.12)	$ 0.12
Income from discontinued operations (in dollars per share)		$ 0.05
Net income (loss) (in dollars per share)	$ (0.12)	$ 0.17
Potentially dilutive shares excluded from calculation of EPS	66,145
Anti-dilutive shares excluded from calculation of EPS	961,710	1,161,710
Dilutive RSU units excluded from calculation of EPS (in shares)	1,714,286	728,570