CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities
Net income (loss)	$ 31,522	$ (2,150)	$ 136,835
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	23,459	24,155	21,620
Impairment of intangible assets	398	1,960	0
Impairment of other assets	2,621	0	0
Stock-based compensation	10,912	7,757	8,647
Amortization of premium on marketable securities	1,255	1,274	2,401
Undistributed earnings of joint ventures	(1,235)	(2,442)	(2,133)
Deferred income tax benefit	(1,779)	(2,936)	(122,136)
Pension settlement	0	87	8,937
Gain on disposal of businesses	(27,444)	0	0
Loss (gain) on disposal of long-lived assets	13	(1,394)	(63)
Changes in operating assets and liabilities, net of acquisitions and disposals:
Accounts receivable	12,098	6,422	(784)
Inventories	9,598	15,490	5,874
Prepaid expenses and other current assets	(12,325)	4,359	5,801
Accounts payable	(11,924)	3,123	(11,182)
Deferred revenue	5,900	8,971	(4,684)
Accrued warranty and retrofit costs	(1,102)	(1,806)	(123)
Accrued compensation and benefits	6,783	(2,625)	(4,878)
Accrued restructuring costs	2,161	(972)	1,930
Accrued pension	997	(950)	(5,772)
Net cash provided by operating activities	1,873	(3,934)	(4,252)
Net cash provided by operating activities	53,781	54,389	36,038
Cash flows from investing activities
Purchases of property, plant and equipment	(5,518)	(3,635)	(8,653)
Purchases of marketable securities	(174,287)	(91,740)	(132,015)
Sale/maturity of marketable securities	112,085	145,023	131,317
Proceeds from divestitures	85,369	0	0
Acquisitions, net of cash acquired	(35,625)	(68,331)	(9,216)
Decrease in restricted cash	177	586	530
Other investment	0	0	(3,000)
Proceeds from the sale of property, plant and equipment	0	14,082	0
Payment of deferred leasing cost	0	(3,134)	0
Net cash used in investing activities	(17,799)	(7,149)	(21,037)
Cash flows from financing activities
Proceeds from issuance of common stock, net of issuance costs	1,838	1,851	1,705
Repayment of capital lease obligations	(239)	0	0
Acquisition of noncontrolling interest	(3,189)	0	0
Common stock dividend paid	(22,875)	(21,328)	(20,953)
Net cash used in financing activities	(24,465)	(19,477)	(19,248)
Effects of exchange rate changes on cash and cash equivalents	(374)	569	53
Net increase (decrease) in cash and cash equivalents	11,143	28,332	(4,194)
Cash and cash equivalents, beginning of year	82,971	54,639	58,833
Cash and cash equivalents, end of year	94,114	82,971	54,639
Supplemental disclosures:
Cash paid during the year for interest	202	2	14
Cash paid (refunded) during the year for income taxes, net	1,084	(762)	4,282
Acquisition of buildings and land through capital lease	$ 8,537	$ 0	$ 0