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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 | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 30, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |
Gross profit |  | $ 227,995 | $ 168,385 | $ 653,125 | $ 382,211 |
Research and development |  | 32,548 | 32,268 | 99,510 | 77,709 |
Selling, general and administrative |  | 71,839 | 68,016 | 218,038 | 161,545 |
Acquisition and integration costs |  | 2,466 | 2,641 | 4,698 | 25,190 |
Restructuring |  | 10 |  | 2,596 | 24 |
Asset impairment |  |  |  | 6,719 |  |
Amortization of intangible assets |  | 10,977 | 12,452 | 34,946 | 22,990 | $ 22,990
Income from operations |  | 110,155 | 53,008 | 286,618 | 94,753 |
Gain on sale of business | $ 74,856 |  |  | 74,856 |  |
Interest and other (expense), net |  | (8,784) | (10,760) | (24,846) | (16,332) |
Income before income taxes |  | 101,371 | 42,248 | 336,628 | 78,421 |
Provision for income taxes |  | 25,377 | 9,699 | 75,134 | 19,099 |
Net income |  | 75,994 | 32,549 | 261,494 | 59,322 |
Vacuum & Analysis [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Gross profit |  | 141,438 | 104,232 | 410,228 | 273,004 |
Light & Motion [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Gross profit |  | $ 86,557 | $ 64,153 | $ 242,897 | $ 109,207 |

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