CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 30, 2012	Mar. 25, 2011	Mar. 26, 2010
CONSOLIDATED STATEMENTS OF CASH FLOWS [Abstract]
Cash and cash equivalents at beginning of period	$ 2,367	$ 4,953	$ 15,589
Cash flows from operating activities:
Net loss	(34,143)	(26,298)	(17,843)
Adjustments required to reconcile net loss to net cash used in operating activities:
Depreciation, amortization, and accretion	2,131	2,469	3,308
Stock-based compensation expense	3,222	5,950	5,789
Gain on extinguishment of debt	0	0	(555)
Loss on disposition of property and equipment	17	29	87
Provision for deferred income taxes	119	195	0
Other	0	(1)	(8)
Changes in assets and liabilities:
Accounts receivable	1,176	4,767	(6,377)
Inventories	(102)	1,386	868
Prepaid expenses and other assets	4,447	1,154	2,475
Accounts payable	(1,488)	(2,486)	3,733
Accrued and other long-term liabilities	(499)	(3,919)	(4,331)
Net cash used in operating activities	(25,120)	(16,754)	(12,854)
Cash flows from investing activities:
Purchase of short-term investments	(29,402)	(43,314)	(62,894)
Proceeds from sales and maturities of short-term investments	59,930	61,705	68,432
Purchases of property and equipment	(773)	(1,563)	(1,737)
Changes in restricted cash	252	(1,637)	608
Net cash provided by investing activities	30,007	15,191	4,409
Cash flows from financing activities:
Issuance of common stock	4	700	661
Repurchase of common stock	(279)	(1,161)	(1,200)
Payments under capital lease and note payable obligations	(136)	(105)	(27)
Repurchase of 3.75% convertible senior notes	0	0	(1,875)
Net cash used in financing activities	(411)	(566)	(2,441)
Effect of exchange rate changes on cash	54	(457)	250
Net increase (decrease) in cash and cash equivalents	4,530	(2,586)	(10,636)
Cash and cash equivalents at end of period	6,897	2,367	4,953
Other cash flow information:
Cash paid during the period for interest	2,124	2,128	2,163
Non-cash investing activities:
Net unrealized loss on available-for-sale securities	(87)	(258)	(386)
Assets acquired under capital lease	0	162	145
Assets acquired through note payable	$ 0	$ 0	$ 141