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Acquisitions and Divestitures (Additional Information - Acquisitions) (Detail) $ in Thousands, € in Millions |  |  |  |  |  |  |  | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
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Aug. 31, 2016 EUR (€) | Aug. 31, 2016 USD ($) | Jul. 01, 2016 EUR (€) | Jul. 01, 2016 USD ($) | Mar. 16, 2016 USD ($) | Dec. 01, 2015 USD ($) | Jul. 01, 2015 USD ($) | Jun. 10, 2015 EUR (€) | Jun. 10, 2015 USD ($) | May 29, 2015 EUR (€) | May 29, 2015 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) | Dec. 31, 2015 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ 280,204 |  |  |  |  |  |  |  |  |  | $ 1,662,892 |  |  |  |  | $ 1,662,892 |  |  | $ 1,396,529
Intangible assets |  | 215,416 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration for acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | $ 4,705 |  |
Akron Brass |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 120,000
Aggregate purchase price, cash paid |  |  |  |  | $ 221,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | 125,090 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  | 90,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indefinite-lived intangible assets acquired |  |  |  |  | $ 28,800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AWG Fittings GmbH (AWG) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40,000
Aggregate purchase price, cash paid |  |  | € 42.8 | $ 47,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | 22,733 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  | $ 10,279 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SFC-Koenig AG (SFC) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 63,000
Aggregate purchase price, cash paid | € 215.9 | 241,100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | 132,381 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  | $ 114,737 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Novotema, SpA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price, cash paid |  |  |  |  |  |  |  |  |  | € 56.0 | $ 61,100 |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  | 34,300 |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  |  |  |  | $ 20,000 |  |  |  |  |  |  |  |  |
Alfa Valvole, s.r.l |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price, cash paid |  |  |  |  |  |  |  | € 99.8 | $ 112,600 |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  | 69,600 |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  |  | $ 32,100 |  |  |  |  |  |  |  |  |  |  |
CIDRA Precision Services, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price, cash paid |  |  |  |  |  |  | $ 19,500 |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | 9,700 |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  | 12,300 |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  |  | 24,200 |  |  |  |  |  |  |  |  |  |  |  |  |
Eran-out |  |  |  |  |  |  | 4,700 |  |  |  |  |  |  |  |  |  |  |  |  |
CIDRA Precision Services, LLC | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration for acquisition |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
CIDRA Precision Services, LLC | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration for acquisition |  |  |  |  |  |  | $ 5,500 |  |  |  |  |  |  |  |  |  |  |  |  |
Complementary Product Line |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 700 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  | $ 1,900 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition-related transaction costs |  |  |  |  |  |  |  |  |  |  |  | 1,600 |  |  | $ 900 |  | 4,000 | 2,100 |  |
Selling, general and administrative expenses | CIDRA Precision Services, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in amount of contingent consideration, liability |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000 | $ 3,700 |  | $ 4,700 |  |  | $ 4,700 |
Cost of goods sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of inventory charges associated with acquisitions |  |  |  |  |  |  |  |  |  |  |  | $ 4,600 |  |  | $ 2,700 |  | $ 10,400 | $ 3,400 |  |

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