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Subsequent Event (Notes) | 12 Months Ended
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Dec. 31, 2019
Subsequent Event [Line Items] |
Subsequent Events [Text Block] | Subsequent Event On January 24, 2020, the Company acquired all of the outstanding equity interests of the federal division of Blackstone Technology Group (“Blackstone Federal”), for $85.0 million in cash. Blackstone Federal is headquartered in Arlington, Virginia. The acquisition expands the Company's capabilities in agile application development, cloud modernization and systems architecture, cybersecurity, user experience design and branding services to government clients. The results of operations of Blackstone Federal, which will be part of the ECS segment, will be included in the consolidated results of the Company the date of its acquisition.

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- Definition The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 855 -URI http://asc.fasb.org/topic&trid=2122774 + Details
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