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Name:	us-gaap_BusinessAcquisitionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Business Acquisitions (Details) - C1 Consulting LLC - USD ($) $ in Millions	Jan. 31, 2017	Dec. 30, 2017
Business Acquisitions
Maximum period for additional purchase consideration to be paid	4 years
Selling, general and administrative expenses
Liabilities Assumed:
Transaction related costs		$ 0.9