Condensed Consolidated Statement of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Dec. 30, 2011	Dec. 24, 2010
Condensed Consolidated Statement of Cash Flows (Unaudited) [Abstract]
Cash and cash equivalents at beginning of period	$ 2,367	$ 4,953
Cash flows from operating activities:
Net loss	(24,319)	(19,426)
Adjustments required to reconcile net loss to net cash used in operating activities:
Depreciation, amortization, and accretion	1,601	1,946
Stock-based compensation expense	2,454	4,504
Loss on disposition of property and equipment	0	28
Provision for deferred income taxes	275	203
Other	0	(1)
Changes in assets and liabilities:
Accounts receivable	(2,936)	4,196
Inventories	(648)	1,018
Prepaid expenses and other assets	2,487	2,092
Accounts payable	(1,555)	(1,344)
Accrued liabilities	(605)	(4,611)
Net cash used in operating activities	(23,246)	(11,395)
Cash flows from investing activities:
Purchase of short-term investments	(23,469)	(33,405)
Proceeds from sales and maturities of short-term investments	49,097	48,929
Purchases of property and equipment	(680)	(1,284)
Change in restricted cash	250	(1,637)
Net cash provided by investing activities	25,198	12,603
Cash flows from financing activities:
Issuance of common stock	1	289
Repurchase of common stock	(253)	(863)
Payments under capital lease and note payable obligations	(101)	(47)
Net cash used in financing activities	(353)	(621)
Effect of exchange rate changes on cash	(134)	(281)
Net increase in cash and cash equivalents	1,465	306
Cash and cash equivalents at end of period	3,832	5,259
Cash paid during the period for:
Interest	2,122	2,112
Non-cash investing activities:
Net unrealized (loss) on available-for-sale securities	(128)	(218)
Assets acquired under capital lease	$ 0	$ 47