Revenue Recognition - Narrative (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018
Revenue from Contract with Customer [Abstract]
Performance obligation, expected timing of satisfaction	30 months
Performance obligation	$ 191,000
Disaggregation of Revenue [Line Items]
Contract liabilities	$ 24,588	$ 37,816
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Expected performance obligation recognized	62.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-10-01
Revenue from Contract with Customer [Abstract]
Performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Expected performance obligation recognized	100.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-10-01
Revenue from Contract with Customer [Abstract]
Performance obligation, expected timing of satisfaction	2 years
Long-term Contract with Customer
Disaggregation of Revenue [Line Items]
Contract liabilities			$ 45,100

Delta Tucker Holdings, Inc. 10-Q