CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Revenue
Product	$ 533,624	$ 421,783	$ 457,411
Services	159,261	138,540	95,297
Total revenue	692,885	560,323	552,708
Cost of revenue
Products	323,812	267,974	298,348
Services	101,669	94,268	65,255
Total cost of revenue	425,481	362,242	363,603
Gross profit	267,404	198,081	189,105
Operating expenses
Research and development	47,004	51,543	52,232
Selling, general and administrative	153,061	130,261	115,270
Restructuring charges			4,417
Restructuring charges	3,226	12,039	4,713
Total operating expenses	203,291	193,843	172,215
Operating income	64,113	4,238	16,890
Interest income	464	452	899
Interest expense	(408)	(157)	(395)
Gain on settlement of equity method investment	1,847
Other (expense) income, net	(645)	(579)	421
Income before income taxes and earnings (losses) of equity method investments	65,371	3,954	17,815
Income tax provision	12,140	75,810	3,430
Income (loss) before equity in earnings (losses) of equity method investments	53,231	(71,856)	14,385
Equity in earnings (losses) of equity method investments	9,381	2,380	(164)
Net income (loss)	$ 62,612	$ (69,476)	$ 14,221
Basic net income (loss) per share (in dollars per share)	$ 0.90	$ (1.01)	$ 0.21
Diluted net income (loss) per share (in dollars per share)	0.89	(1.01)	0.21
Dividend declared per share (in dollars per share)	$ 0.40	$ 0.40	$ 0.40
Weighted-average shares used in computing net income (loss) per share:
Basic (in shares)	69,575	68,507	67,411
Diluted (in shares)	70,485	68,507	68,549