Discontinued Operations (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Jan. 25, 2014	Jan. 26, 2013	Jan. 25, 2014	Jan. 26, 2013
Discontinued Operations [Abstract]
Impairment of asset to be disposed of			$ 1,149	$ 0
Results of the discontinued operations [Abstract]
Income (loss) from discontinued operations	(717)	291	(864)	465
Bauhaus Operating unit [Member]
Results of the discontinued operations [Abstract]
Net sales	9,101	8,937	27,100	27,142
Income (loss) from discontinued operations (including impairment of $1.1 million in fiscal 2014)	(1,097)	468	(1,323)	747
Income tax benefit (expense)	380	(177)	459	(282)
Income (loss) from discontinued operations	(717)	291	(864)	465
Assets and Liabilities of discontinued operations [Abstract]
Receivables, net	3,672		3,672
Inventories, net	4,683		4,683
Other current assets	50		50
Property, plant, and equipment, net	518		518
Total assets	8,923		8,923
Accounts payable	1,777		1,777
Accrued expenses and other current liabilities	876		876
Total liabilities	$ 2,653		$ 2,653

The aggregate value (measured at the lower of net carrying value or fair value less cost of disposal) for noncurrent assets (assets with expected useful life longer than one year or one operating cycle, whichever is longer) of a disposal group, including a component of the entity (discontinued operation), to be sold or that has subsequently been disposed of through sale, as of the financial statement date.

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Tax effect allocated to a disposal group that is classified as a component of the entity reported as a separate component of income before extraordinary items. Includes the tax effects of the following: income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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For the disposal group, including a component of the entity (discontinued operation), the aggregate of amounts due from customers or clients for goods or services that have been delivered or sold in the normal course of business and an amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection and net of any write-downs taken for collection uncertainty on the part of the holder, respectively.

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Amount of sales or other form of revenues attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period.

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Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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