CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities
Net (loss) income	$ (88,587)	$ (23)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	13,849	12,733
Stock-based compensation	6,568	7,108
Amortization of premium on marketable securities	315	634
Undistributed (earnings) losses of equity method investments	(869)	605
Deferred income tax provision (benefit)	73,454	(2,728)
Gain on disposal of long-lived assets	0	(4)
Changes in operating assets and liabilities, net of acquisitions and disposals:
Accounts receivable	(664)	(13,269)
Inventories	(374)	2,474
Prepaid expenses and other current assets	(2,046)	(5,365)
Accounts payable	(7,073)	8,345
Deferred revenue	15,538	(3,868)
Accrued warranty and retrofit costs	(333)	(274)
Accrued compensation and benefits	(7,297)	(6,200)
Accrued restructuring costs	5,323	(6)
Accrued expenses and other current liabilities	(7,433)	4,791
Net cash provided by operating activities	371	4,953
Cash flows from investing activities
Purchases of property, plant and equipment	(6,090)	(3,647)
Purchases of marketable securities	(12,900)	(30,739)
Sales and maturities of marketable securities	139,388	47,625
Disbursement for a loan receivable	741	0
Acquisitions, net of cash acquired	(125,498)	(17,257)
Proceeds from sales of property, plant and equipment	0	6
Purchases of other investments	(250)	(5,000)
Net cash used in investing activities	(6,091)	(9,012)
Cash flows from financing activities
Proceeds from issuance of common stock	948	867
Principal repayments of capital lease obligations	0	(244)
Common stock dividends paid	(13,738)	(13,480)
Net cash used in financing activities	(12,790)	(12,857)
Effects of exchange rate changes on cash and cash equivalents	(50)	(4,022)
Net decrease in cash and cash equivalents	(18,560)	(20,938)
Cash and cash equivalents, beginning of period	80,722	94,114
Cash and cash equivalents, end of period	$ 62,162	$ 73,176