CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities
Net income (loss)	$ (80,022)	$ 7,658
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	21,320	18,929
Stock-based compensation	8,206	9,510
Amortization of premium on marketable securities and deferred financing costs	368	917
Undistributed (earnings) losses of equity method investments	(1,248)	313
Deferred income tax provision (benefit)	71,875	(2,262)
Gain on disposal of long-lived assets	0	(4)
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	2,862	(19,070)
Inventories	2,110	(1,519)
Prepaid expenses and other current assets	(3,909)	(4,881)
Accounts payable	(4,689)	11,600
Deferred revenue	7,171	(2,339)
Accrued warranty and retrofit costs	(87)	(320)
Accrued compensation and benefits	(6,558)	(1,907)
Accrued restructuring costs	3,720	(660)
Accrued expenses and other current liabilities	(5,010)	5,506
Net cash provided by operating activities	16,109	21,471
Cash flows from investing activities
Purchases of property, plant and equipment	(9,414)	(5,945)
Purchases of marketable securities	(12,901)	(58,991)
Sales and maturities of marketable securities	139,388	74,515
Disbursement for a loan receivable	(1,491)	0
Acquisitions, net of cash acquired	(125,498)	(17,257)
Proceeds from sales of property, plant and equipment	0	6
Purchases of other investments	(500)	(5,000)
Net cash used in investing activities	(10,416)	(12,672)
Cash flows from financing activities
Proceeds from issuance of common stock	948	867
Principal repayments of capital lease obligations	0	(368)
Payment of deferred financing costs	(508)	0
Common stock dividends paid	(20,613)	(20,229)
Net cash used in financing activities	(20,173)	(19,730)
Effects of exchange rate changes on cash and cash equivalents	(126)	(3,513)
Net decrease in cash and cash equivalents	(14,606)	(14,444)
Cash and cash equivalents, beginning of period	80,722	94,114
Cash and cash equivalents, end of period	$ 66,116	$ 79,670