Basis of Presentation and Summary of Critical Accounting Policies	3 Months Ended
	Jul. 30, 2011
Basis of Presentation and Summary of Critical Accounting Policies [Abstract]
Basis of Presentation and Summary of Critical Accounting Policies	Note 1. Basis of Presentation and Summary of Critical Accounting Policies In the opinion of management, the accompanying unaudited consolidated financial statements contain all adjustments (consisting of normal recurring adjustments) necessary to fairly present our financial position, results of operations and cash flows for the periods presented. The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts therein. Due to the inherent uncertainty involved in making estimates, actual results in future periods may differ from those estimates. Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America have been condensed or omitted. The balance sheet at April 30, 2011 has been derived from the audited financial statements at that date, but it does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. These financial statements should be read in conjunction with our financial statements and notes thereto for the year ended April 30, 2011, which are contained in our Annual Report on Form 10-K previously filed with the Securities and Exchange Commission. The results of operations for the interim periods presented are not necessarily indicative of results that may be expected for any other interim period or for the full fiscal year. Revenue Recognition On May 1, 2011, we prospectively adopted the Accounting Standard Updates (“ASU”) 2009-13 “Multiple-Deliverable Revenue Arrangement a Consensus of the FASB Emerging Issues Task Force” regarding revenue recognition for multiple deliverable arrangements and arrangements that include software element. The update requires a vendor to allocate revenue in an arrangement using its best estimate of selling price if neither vendor specific objective evidence nor third party evidence of selling price exists. The residual method of revenue allocation is no longer permissible. The accounting standard update did not change our units of accounting for bundled arrangements, nor do they materially change how we allocate arrangement consideration to our various products and services. Accordingly, the adoption of the standard update did not have a significant impact on our consolidated financial statements. Multiple-element arrangements: We generate revenue from the sale of equipment and related services, including customization, installation and maintenance services. In some instances, we provide some or all of such equipment and services to our customers under the terms of a single multiple-element sales arrangement. These arrangements typically involve the sale of equipment bundled with some or all of these services, but may also involve instances in which we have contracted to deliver multiple pieces of equipment over time, rather than at a single point in time. When a sales arrangement involves multiple elements, the items included in the arrangement (deliverables) are evaluated pursuant to ASC 605-25, Revenue Arrangements with Multiple Deliverables, to determine whether they represent separate units of accounting. We perform this evaluation at the inception of an arrangement and as we deliver each item in the arrangement. Generally, we account for a deliverable (or a group of deliverables) separately if the delivered item(s) has standalone value to the customer and if we have given the customer a general right of return relative to the delivered item(s) and delivery or performance of the undelivered item(s) or service(s) is probable and substantially in our control. When items included in a multiple-element arrangement represent separate units of accounting, we allocate the arrangement consideration to the individual items based on their relative selling values. The amount of arrangement consideration allocated to the delivered item(s) is limited to the amount that is not contingent on us delivering additional products or services. Once we have determined the amount, if any, of arrangement consideration allocable to the delivered item(s), we apply the applicable revenue recognition policy, as described in our most recent Annual Report on Form 10-K filed with the Securities and Exchange Commission, to determine when and by which method such amount may be recognized as revenue. We generally determine if objective and reliable evidence of selling prices for the items included in a multiple-element arrangement exists based on whether we have vendor-specific objective evidence of the price for which we sell an item on a standalone basis. If we do not have vendor-specific objective evidence for the item, we will use the price charged by a competitor selling a comparable product or service on a standalone basis to similarly situated customers, if available. If neither vendor-specific objective evidence nor third party evidence is available, we use our best estimate of the selling price for that deliverable. All other revenue recognition accounting policies are explained in note one of the Notes to Consolidated Financial Statements in our Annual Report on Form 10-K for the fiscal year ended April 30, 2011.