RETIREMENT SAVINGS PLANS	12 Months Ended
Jun. 30, 2018
Compensation And Retirement Disclosure [Abstract]
RETIREMENT SAVINGS PLANS	NOTE 20. RETIREMENT SAVINGS PLANS 401(k) Plan The Company maintains a defined contribution plan under Section 401(k) of the Internal Revenue Code, the CACI $MART Plan (the 401(k) Plan). Employees can contribute up to 75 percent (subject to certain statutory limitations) of their total cash compensation. The Company provides matching contributions equal to 50 percent of the amount of salary deferral employees elect, up to 6 percent of each employee’s total calendar year cash compensation, as defined. The Company may also make discretionary profit sharing contributions to the 401(k) Plan. Employee contributions vest immediately. Employer contributions vest in full after three- years of employment. Total 401(k) Plan Company contribution expense for the years ended June 30, 2018, 2017, and 2016 were $27.1 million, $24.0 million, and $25.5 million, respectively. The Company maintains several qualified 401(k) profit-sharing plans (PSP) that cover eligible employees. Employees are eligible to participate in the PSP beginning on the first of the month following the start of employment and attainment of age 18. Under the PSP, the Company may make discretionary contributions based on a percentage of the total compensation of all eligible participants. Company contribution expense for the year ended June 30, 2018, 2017 and 2016 was $26.3 million, $22.8 million and $20.6 million, respectively. International Operations Defined Contribution Plans The Company maintains defined contribution pension plans in the U.K. and in the Netherlands. In the U.K., employees can elect the amount of pension contributions that they wish to make subject to certain U.K. tax limits. Under the Dutch plan, the amounts the Company contributes are based on the employee’s age. In both countries, the contributions are deemed to be company contributions and vest immediately. Contributions to these plans and their predecessor plans for the years ended June 30, 2018, 2017, and 2016 were $2.0 million, $1.5 million, and $1.4 million, respectively. Supplemental Savings Plan The Company maintains the Supplemental Savings Plan through which, on a calendar year basis, officers at the director level and above can elect to defer for contribution to the Supplemental Savings Plan up to 50 percent of their base compensation and up to 100 percent of their bonuses. The Company provides a contribution of 5 percent of compensation for each participant’s compensation that exceeds the limit as set forth in IRC 401(a)(17) (currently $275,000 per year). The Company also has the option to make annual discretionary contributions. Company contributions vest after five-years of contributions, and vesting is accelerated in the event of a change of control of the Company. Participant deferrals and Company contributions will be credited with the rate of return based on the investment options and asset allocations selected by the Participant. Participants may change their asset allocation as often as daily, if they so choose. A Rabbi Trust has been established to hold and provide a measure of security for the investments that finance benefit payments. Distributions from the Supplemental Savings Plan are made upon retirement, termination, death, or total disability. The Supplemental Savings Plan also allows for in-service distributions. Supplemental Savings Plan obligations due to participants totaled $93.8 million at June 30, 2018, of which $7.0 million is included in accrued compensation and benefits in the accompanying consolidated balance sheet. Supplemental Savings Plan obligations increased by $5.9 million during the year ended June 30, 2018, consisting of $3.7 million of investment gains, $9.9 million of participant compensation deferrals, and $0.8 million of Company contributions, offset by $8.5 million of distributions. The Company maintains COLI assets in a Rabbi Trust to offset the obligations under the Supplemental Savings Plan. The value of the COLI in the Rabbi Trust was $91.5 million at June 30, 2018 and COLI gains were $3.5 million for the year ended June 30, 2018. The value of the COLI in the Rabbi Trust was $91.4 million at June 30, 2017 and COLI gains were $4.6 million for the year ended June 30, 2017. Contribution expense for the Supplemental Savings Plan during the years ended June 30, 2018, 2017, and 2016, was $1.2 million, $0.7 million, and $0.5 million, respectively.

NOTE 20. RETIREMENT SAVINGS PLANS

401(k) Plan

The Company maintains a defined contribution plan under Section 401(k) of the Internal Revenue Code, the CACI $MART Plan (the 401(k) Plan). Employees can contribute up to 75 percent (subject to certain statutory limitations) of their total cash compensation. The Company provides matching contributions equal to 50 percent of the amount of salary deferral employees elect, up to 6 percent of each employee’s total calendar year cash compensation, as defined. The Company may also make discretionary profit sharing contributions to the 401(k) Plan. Employee contributions vest immediately. Employer contributions vest in full after three- years of employment. Total 401(k) Plan Company contribution expense for the years ended June 30, 2018, 2017, and 2016 were $27.1 million, $24.0 million, and $25.5 million, respectively.

The Company maintains several qualified 401(k) profit-sharing plans (PSP) that cover eligible employees. Employees are eligible to participate in the PSP beginning on the first of the month following the start of employment and attainment of age 18. Under the PSP, the Company may make discretionary contributions based on a percentage of the total compensation of all eligible participants. Company contribution expense for the year ended June 30, 2018, 2017 and 2016 was $26.3 million, $22.8 million and $20.6 million, respectively.

International Operations Defined Contribution Plans

The Company maintains defined contribution pension plans in the U.K. and in the Netherlands. In the U.K., employees can elect the amount of pension contributions that they wish to make subject to certain U.K. tax limits. Under the Dutch plan, the amounts the Company contributes are based on the employee’s age. In both countries, the contributions are deemed to be company contributions and vest immediately. Contributions to these plans and their predecessor plans for the years ended June 30, 2018, 2017, and 2016 were $2.0 million, $1.5 million, and $1.4 million, respectively.

Supplemental Savings Plan

The Company maintains the Supplemental Savings Plan through which, on a calendar year basis, officers at the director level and above can elect to defer for contribution to the Supplemental Savings Plan up to 50 percent of their base compensation and up to 100 percent of their bonuses. The Company provides a contribution of 5 percent of compensation for each participant’s compensation that exceeds the limit as set forth in IRC 401(a)(17) (currently $275,000 per year). The Company also has the option to make annual discretionary contributions. Company contributions vest after five-years of contributions, and vesting is accelerated in the event of a change of control of the Company. Participant deferrals and Company contributions will be credited with the rate of return based on the investment options and asset allocations selected by the Participant. Participants may change their asset allocation as often as daily, if they so choose. A Rabbi Trust has been established to hold and provide a measure of security for the investments that finance benefit payments. Distributions from the Supplemental Savings Plan are made upon retirement, termination, death, or total disability. The Supplemental Savings Plan also allows for in-service distributions.

Supplemental Savings Plan obligations due to participants totaled $93.8 million at June 30, 2018, of which $7.0 million is included in accrued compensation and benefits in the accompanying consolidated balance sheet. Supplemental Savings Plan obligations increased by $5.9 million during the year ended June 30, 2018, consisting of $3.7 million of investment gains, $9.9 million of participant compensation deferrals, and $0.8 million of Company contributions, offset by $8.5 million of distributions.

The Company maintains COLI assets in a Rabbi Trust to offset the obligations under the Supplemental Savings Plan. The value of the COLI in the Rabbi Trust was $91.5 million at June 30, 2018 and COLI gains were $3.5 million for the year ended June 30, 2018. The value of the COLI in the Rabbi Trust was $91.4 million at June 30, 2017 and COLI gains were $4.6 million for the year ended June 30, 2017.

Contribution expense for the Supplemental Savings Plan during the years ended June 30, 2018, 2017, and 2016, was $1.2 million, $0.7 million, and $0.5 million, respectively.