Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jul. 27, 2013	Jul. 28, 2012
Operating activities
Net loss	$ (7,210)	$ (1,386)
Adjustments to reconcile net loss to cash used in operating activities:
Depreciation and amortization	2,185	2,932
Provision for doubtful accounts	122	240
Deferred income taxes	(23)	42
Stock-based compensation	910	840
Change in fair value of conversion feature of convertible bonds	3,391
Tax benefit from exercise of stock options	28	88
Changes in operating assets and liabilities:
Accounts receivable	44	6,297
Unbilled receivables and retentions	1,585	3,776
Inventories	(6,102)	(966)
Income tax receivable	(3,035)	(1,755)
Other assets	538	433
Accounts payable	(2,599)	(7,128)
Other liabilities	(3,010)	(21,183)
Net cash used in operating activities	(13,176)	(17,770)
Investing activities
Acquisitions of property and equipment	(4,457)	(2,548)
Net redemptions of held-to-maturity investments	6,442	9,064
Net sales of available-for-sale investments	175	175
Net cash provided by investing activities	2,160	6,691
Financing activities
Exercise of stock options	23	69
Net cash provided by financing activities	23	69
Net decrease in cash and cash equivalents	(10,993)	(11,010)
Cash and cash equivalents at beginning of period	75,332	64,220
Cash and cash equivalents at end of period	64,339	53,210
Supplemental disclosure:
Unrealized (loss) gain on long-term investments recorded in other comprehensive (loss) income, net of deferred taxes of $32 and $24, respectively	(48)	37
Reclassification from share-based liability compensation to equity		$ 401