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Acquisitions and Purchase Accounting Estimated Fair Values of Assets Acquired and Liabilities Assumed for Marsal Acquisition (Details) (USD $) In Thousands, unless otherwise specified	Apr. 04, 2015	Jan. 03, 2015	Feb. 10, 2015
Business Acquisition [Line Items]
Goodwill	$ 819,274us-gaap_Goodwill	$ 808,491us-gaap_Goodwill
as initially reported \| Marsal [Member]
Business Acquisition [Line Items]
Current assets			455
Property, plant and equipment			201
Goodwill			3,012
Other intangibles			2,027
Current liabilities			(195)
Net assets acquired and liabilities assumed			$ 5,500