CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Revenue
Products	$ 160,491	$ 132,613	$ 302,675	$ 254,727
Services	46,769	36,720	93,913	74,561
Total revenue	207,260	169,333	396,588	329,288
Cost of revenue
Products	94,358	82,023	178,534	157,701
Services	28,673	22,786	58,610	50,120
Total cost of revenue	123,031	104,809	237,144	207,821
Gross profit	84,229	64,524	159,444	121,467
Operating expenses
Research and development	13,125	11,345	26,324	22,190
Selling, general and administrative	47,236	37,518	88,412	69,479
Restructuring charges	49	860	49	1,835
Total operating expenses	60,410	49,723	114,785	93,504
Operating income	23,819	14,801	44,659	27,963
Interest income	356	227	504	294
Interest expense	(2,196)	(97)	(4,377)	(193)
Gain on settlement of equity method investment				1,847
Other expenses, net	(261)	(283)	(1,912)	(534)
Income before income taxes and earnings of equity method investments	21,718	14,648	38,874	29,377
Income tax (benefit) provision	(43,880)	3,420	(41,030)	6,220
Income before equity in earnings of equity method investments	65,598	11,228	79,904	23,157
Equity in earnings of equity method investments	1,422	2,777	3,602	4,719
Net income	$ 67,020	$ 14,005	$ 83,506	$ 27,876
Basic net income per share (in dollars per share)	$ 0.95	$ 0.20	$ 1.19	$ 0.40
Diluted net income per share (in dollars per share)	0.95	0.20	1.18	0.40
Dividend declared per share (in dollars per share)	$ 0.10	$ 0.10	$ 0.20	$ 0.20
Weighted average shares used in computing net income per share:
Basic (in shares)	70,220	69,600	70,340	69,388
Diluted (in shares)	70,613	70,149	70,908	70,073