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Business Segment, Geographic Area, Product and Significant Customer Information - Reconciliation of Segment Gross Profit to Consolidated Net Income (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Apr. 30, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Gross profit		$ 219,583	$ 135,913	$ 425,130	$ 213,826
Research and development		33,680	28,214	66,962	45,441
Selling, general and administrative		71,979	59,579	146,199	93,529
Acquisition and integration costs		790	20,055	2,232	22,549
Restructuring		2,064	24	2,586	24
Asset impairment		6,719		6,719
Amortization of intangible assets		11,468	8,855	23,969	10,538	$ 10,538
Income from operations		92,883	19,186	176,463	41,745
Gain on sale of business	$ 74,856	74,856		74,856
Interest and other (expense), net		(9,767)	(6,818)	(16,062)	(5,572)
Income before income taxes		157,972	12,368	235,257	36,173
Provision for income taxes		37,532	3,158	49,757	9,400
Net income		120,440	9,210	185,500	26,773
Vacuum & Analysis [Member]
Segment Reporting Information [Line Items]
Gross profit		139,867	90,859	268,790	168,772
Light & Motion [Member]
Segment Reporting Information [Line Items]
Gross profit		$ 79,716	$ 45,054	$ 156,340	$ 45,054

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