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Acquisitions (Detail) € in Millions			3 Months Ended
	Apr. 26, 2017 USD ($)	Apr. 26, 2017 EUR (€)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)
Business Acquisition [Line Items]
Business combination, consideration transferred			$ 41,000,000	$ 24,600,000
Acquisitions of businesses, net of cash acquired			8,200,000	11,700,000
Payments of contingent consideration for acquisitions			32,800,000
Payments of contingent consideration for acquisitions			8,700,000	12,900,000
Payment for contingent consideration liability, operating activities			24,100,000
7S Group GmbH
Business Acquisition [Line Items]
Initial acquisition payments				$ 10,300,000
7S Group GmbH
Business Acquisition [Line Items]
Loss Contingency, Damages Sought, Value	$ 25,600,000	€ 20.8
Loss Contingency, Estimate of Possible Loss			$ 0

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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