RELATED PARTY TRANSACTIONS (Details) - USD ($)			3 Months Ended
	Jun. 19, 2017	Apr. 04, 2017	Jun. 30, 2017	Jul. 24, 2017
Related Party Loans
Exercise price of warrants (in dollars per share)			$ 1.00
Initial Stockholders
Founder Shares
Percentage of shares held by related party			0.20%
Holding period of founder shares			1 year
Affiliate of Sponsor | Administrative Support Agreement
Administrative Support Agreement
Monthly service fees			$ 10,000
Maximum
Related Party Loans
Conversion of working capital loan to warrants			$ 2,000,000
Class A Common Stock
Founder Shares
Aggregated shares issued			0
Common stock, par value			$ 0.0001
Related Party Loans
Exercise price of warrants (in dollars per share)				$ 11.50
Number of warrants issued in exchange for working capital loan			2,000,000
Class A Common Stock | Initial Stockholders
Founder Shares
Stock price threshold that allows transfer of shares			$ 12.00
Number of trading days within 30 days required for the transfer, assignment or sale of shares			20 days
Period over which the required trading days of shares at $12.00 per share or over had to occur			30 days
Minimum period after initial business combination to allow transfer of founders shares			150 days
Class F Common Stock
Founder Shares
Aggregated shares issued	11,500,000		11,500,000
Common stock, par value			$ 0.0001
Founder shares aggregate (in shares)			1,500,000
Founder Shares Maximum Number of Shares Subject to Forfeiture to Maintain Percentage of Issued and Outstanding Shares Held by Initial Stockholders			1,500,000
Class F Common Stock | Federal Street Sponsor LLC
Founder Shares
Aggregated shares issued		10,062,500
Stock dividend shares	1,437,500
Proceeds from issuance of common stock		$ 25,000
Founder shares aggregate (in shares)			1,500,000
Class F Common Stock | Initial Stockholders
Founder Shares
Percentage of shares held by related party			20.00%
IPO | Federal Street Sponsor LLC | Promissory Note
Related Party Loans
Maximum borrowing capacity			$ 300,000
Outstanding borrowing			$ 150,000