CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Revenue
Products	$ 482,389	$ 406,986	$ 335,923
Services	149,171	120,513	98,089
Total revenue	631,560	527,499	434,012
Cost of revenue
Products	288,323	249,396	212,029
Services	97,156	79,216	65,294
Total cost of revenue	385,479	328,612	277,323
Gross profit	246,081	198,887	156,689
Operating expenses
Research and development	46,936	39,875	44,241
Selling, general and administrative	167,022	141,549	119,292
Restructuring charges	714	3,144	10,210
Total operating expenses	214,672	184,568	173,743
Operating income (loss)	31,409	14,319	(17,054)
Interest income	1,881	464	452
Interest expense	(9,520)	(408)	(157)
Gain on settlement of equity method investment		1,847
Other expenses, net	(3,304)	(1,702)	(1,383)
Income (loss) before income taxes and earnings of equity method investments	20,466	14,520	(18,142)
Income tax provision (benefit)	(47,251)	3,380	66,250
Income (loss) before equity in earnings of equity method investments	67,717	11,140	(84,392)
Equity in earnings of equity method investments		(453)	(1,065)
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest, Total	67,717	10,687	(85,457)
Income from discontinued operations, net of tax	48,747	51,925	15,981
Net income (loss)	116,464	62,612	(69,476)
Net loss attributable to noncontrolling interest	111
Net income (loss) attributable to Brooks Automation, Inc	$ 116,575	$ 62,612	$ (69,476)
Basic net income (loss) per share attributable to Brooks Automation, Inc. common stockholders:
Income (loss) from continuing operations (in dollars per share)	$ 0.96	$ 0.15	$ (1.25)
Income from discontinued operations, net of tax (in dollars per share)	0.69	0.75	0.23
Basic net income (loss) per share (in dollars per share)	1.65	0.90	(1.01)
Diluted net income (loss) per share attributable to Brooks Automation, Inc. common stockholders:
Income (loss) from continuing operations (in dollars per share)	0.95	0.15	(1.25)
Income from discontinued operations, net of tax (in dollars per share)	0.69	0.74	0.23
Diluted net income (loss) per share (in dollars per share)	1.64	0.89	(1.01)
Dividend declared per share (in dollars per share)	$ 0.40	$ 0.40	$ 0.40
Weighted average shares used in computing net income per share:
Basic (in shares)	70,489	69,575	68,507
Diluted (in shares)	70,937	70,485	68,507