Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended	9 Months Ended		12 Months Ended
	Jul. 01, 2018	Dec. 31, 2017	Jul. 02, 2017	Apr. 02, 2017	Apr. 01, 2018	Jul. 01, 2018	Jul. 02, 2017	Sep. 30, 2018	Oct. 01, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Effective tax rate (as a percent)						20.00%	30.40%
Deferred tax benefit from tax reform remeasurement		$ 10,100
Effective income tax rate excluding revaluation of deferred taxes (as a percent)					27.40%
Incremental tax expense from disposition of business	$ 2,600
Goodwill written off related to sale of divested business	12,200					$ 12,160
Tax benefit recognized in connection with the IRS examination	400			$ 1,200
Payments made to tax authorities	7,600		$ 21,500
Effective income tax rate excluding excess tax benefit and TCJA impacts (as a percent)						25.00%	29.50%
Liability for uncertain tax positions	8,900					$ 8,900			$ 6,000
Period during which unrecognized tax benefits would affect the effective tax rate						12 months
Foreign Tax Authority
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reserve for uncertain tax position in connection with IRS examination				$ 2,300
Scenario, Forecast
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Statutory federal tax rate								24.50%
Disposed of by sale | Non-core field services business
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loss on disposition of business	$ 3,400					$ 3,400