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Acquisitions - Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Jul. 31, 2017 | Sep. 19, 2016
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Globe Holding Company LLC |  |  |
Business Acquisition [Line Items] |  |  |
Current assets (including cash) |  | $ 28,600 |
Cash included in current assets |  | 58 |
Property, plant and equipment and other noncurrent assets |  | 8,700 |
Goodwill |  | 71,700 |
Total assets acquired |  | 219,700 |
Total liabilities assumed |  | 5,700 |
Net assets acquired |  | 214,000 |
Senscient, Inc. |  |  |
Business Acquisition [Line Items] |  |  |
Current assets (including cash) |  |  | $ 5,900
Cash included in current assets |  |  | 700
Property, plant and equipment and other noncurrent assets |  |  | 300
Goodwill | $ 10,500 |  | 10,500
Total assets acquired |  |  | 21,100
Total liabilities assumed |  |  | 2,000
Net assets acquired |  |  | 19,100
Trade name | Globe Holding Company LLC |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets |  | 60,000 |
Distributor relationships | Globe Holding Company LLC |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets |  | 40,200 |
Acquired technology and other intangible assets | Globe Holding Company LLC |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets |  | $ 10,500 |
Acquired technology and other intangible assets | Senscient, Inc. |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets |  |  | 1,600
Customer-related intangibles | Senscient, Inc. |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets |  |  | $ 2,800

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