CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Cash flows from operating activities
Net income (loss)	$ 128,404	$ 59,025	$ (227,773)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	17,249	18,420	25,856
Impairment of assets			107,312
Gain on sale of intellectual property rights		(7,840)
Stock-based compensation	6,752	6,567	5,817
Amortization of premium on marketable securities	2,283	942	127
Undistributed (earnings) losses of joint ventures	(383)	(215)	213
Gain on sale of contract manufacturing business	(45,009)
Loss on disposal of long-lived assets	10	4	17
Loss on investment		191	1,185
Changes in operating assets and liabilities, net of acquisitions and disposals:
Accounts receivable	9,916	(53,163)	29,963
Inventories	(19,131)	(31,341)	21,779
Prepaid expenses and other current assets	1,806	(499)	4,527
Accounts payable	(15,099)	39,352	(10,947)
Deferred revenue	1,841	1,487	(676)
Accrued warranty and retrofit costs	(1,420)	2,483	(2,496)
Accrued compensation and benefits	2,036	(913)	(3,869)
Accrued restructuring costs	(3,212)	(4,123)	(5,007)
Accrued expenses and other current liabilities	1,607	(2,505)	(2,522)
Net cash provided by (used in) operating activities	87,650	27,872	(56,494)
Cash flows from investing activities
Purchases of property, plant and equipment	(6,455)	(3,472)	(11,339)
Purchases of marketable securities	(186,718)	(117,473)	(59,091)
Sale/maturity of marketable securities	120,095	84,546	75,628
Increase in restricted cash	(1,293)
Proceeds from the sale of the contract manufacturing business	78,249
Acquisitions, net of cash acquired	(88,309)
Proceeds from the sale of intellectual property rights		7,840
Purchase of intangible assets		(892)
Other	181	243	1,055
Net cash (used in) provided by investing activities	(84,250)	(29,208)	6,253
Cash flows from financing activities
Proceeds from the issuance of common stock under stock option and stock purchase plans	1,358	1,245	1,248
Common stock dividend paid	(5,180)
Net cash (used in) provided by financing activities	(3,822)	1,245	1,248
Effects of exchange rate changes on cash and cash equivalents	(568)	(71)	(1,291)
Net decrease in cash and cash equivalents	(990)	(162)	(50,284)
Cash and cash equivalents, beginning of year	59,823	59,985	110,269
Cash and cash equivalents, end of year	58,833	59,823	59,985
Supplemental disclosures:
Cash paid during the year for interest	65	80	454
Cash paid (refunded) during the year for income taxes, net	$ 1,042	$ (1,866)	$ 246