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Subsequent Events - $ / shares		6 Months Ended
Subsequent Events - $ / shares	Feb. 15, 2022	Dec. 31, 2021
Subsequent Events [Abstract]
Subsequent Events		Subsequent Events On February 7, 2022, the Board of Directors approved an equity retention plan for Mercury’s executive leadership team and over 100 additional leaders. Employees participating in the equity retention plan will be granted equity awards on February 15, 2022. Consistent with the Company’s prior practice for granting equity awards, the number of shares to be granted on February 15, 2022 will be determined by dividing the target value for grantees by the average closing price of Mercury’s common stock during the 30 calendar days prior to February 15, 2022. However, if the average closing price is lower than $55.00 per share, then a minimum of $55.00 per share will be used to calculate the number of shares to be granted. Additional details about the equity retention plan are contained in the Current Report on Form 8-K filed by the Company with the SEC on February 8, 2022.
Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit	$ 55