CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands	6 Months Ended
Oct. 01, 2011	Oct. 02, 2010
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ 14,450	$ (410)
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Depreciation and amortization	5,411	5,127
Amortization of acquired intangible assets	894	1,011
Share-based compensation expense	7,153	5,197
Provision for (recovery of) doubtful accounts	50	(150)
Gain on sale of previously impaired auction rate securities	(2,729)
Loss on disposal of property, plant and equipment	2	72
Deferred income taxes	2,286	(2,285)
Changes in operating accounts:
Decrease (increase) in trade receivables, net	14,545	(7,594)
Increase in inventories	(9,704)	(1,691)
Decrease (increase) in shipped systems pending acceptance	3,950	(2,179)
Decrease in other current assets	2,598	644
(Decrease) increase in accounts payable and accrued liabilities	(16,680)	12,088
(Decrease) increase in deferred revenue	(6,690)	3,062
Net cash provided by operating activities	15,536	12,892
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of investments	(436,281)	(162,541)
Proceeds from sales and maturities of investments	394,023	160,072
Proceeds from sale of auction rate securities	6,450
(Increase) decrease in restricted cash	(11,500)	55
Purchase of property, plant and equipment	(3,445)	(2,621)
Cash paid to acquire the assets of PyroPhotonics Lasers, Inc.		(8,075)
Decrease (increase) in other assets	217	(8)
Net cash used in investing activities	(50,536)	(13,118)
CASH FLOWS FROM FINANCING ACTIVITIES
Stock plan activity, net	1,686	219
Excess tax benefit of share-based compensation	519
Net cash provided by financing activities	2,205	219
Effect of exchange rate changes on cash	526	1,092
NET CHANGE IN CASH AND CASH EQUIVALENTS	(32,269)	1,085
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	116,412	39,335
CASH AND CASH EQUIVALENTS AT END OF PERIOD	84,143	40,420
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for income taxes	(2,383)	(1,050)
Income tax refunds received	$ 120	$ 692

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The effect of exchange rate changes on cash balances held in foreign currencies.

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Reductions in the entity's income taxes that arise when compensation cost (from non-qualified share-based compensation) recognized on the entity's tax return exceeds compensation cost from equity-based compensation recognized in financial statements. This element represents the cash inflow reported in the enterprise's financing activities.

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