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Receivables	9 Months Ended
Receivables	Jan. 28, 2012
Receivables [Abstract]
Receivables	Note 11. Receivables We sell our products throughout the United States and certain foreign countries on credit terms that we establish for each customer. On the sale of certain products, we have the ability to file a contractor's lien against the product installed as collateral. Foreign sales are at times secured by irrevocable letters of credit or bank guarantees. Accounts receivable are reported net of an allowance for doubtful accounts of $2,422 and $2,548 at January 28, 2012 and April 30, 2011, respectively. We make estimates regarding the collectability of our accounts receivable, long-term receivables, costs and estimated earnings in excess of billings and other receivables. In evaluating the adequacy of our allowance for doubtful accounts, we analyze specific balances, customer creditworthiness, changes in customer payment cycles, and current economic trends. If the financial condition of any customer was to deteriorate, resulting in an impairment of its ability to make payments, additional allowances may be required. We charge off receivables at such time as it is determined that collection will not occur. Charge offs of receivables and our allowance for doubtful accounts related to financing receivables are not material to our financial results. In connection with certain sales transactions, we have entered into sales contracts with installment payments exceeding six months and sales type leases. The present value of these contracts and leases is recorded as a receivable upon the installation and acceptance of the equipment, and profit is recognized to the extent that the present value is in excess of cost. We generally retain a security interest in the equipment or in the cash flow generated by the equipment until the contract is paid. The present values of long-term contract and lease receivables, including accrued interest and current maturities, were $18,980 and $18,901 as of January 28, 2012 and April 30, 2011, respectively. Contract and lease receivables bearing annual interest rates of 6.0% to 12.0% are due in varying annual installments through July 2020. The face amount of long-term receivables was $22,296 and $22,807 as of January 28, 2012 and April 30, 2011, respectively. Included in accounts receivable as of January 28, 2012 and April 30, 2011 was $121 and $31, respectively, of retainage on construction-type contracts, all of which is expected to be collected in one year.