Subsequent Events (Details) - USD ($)			9 Months Ended	10 Months Ended
	Apr. 04, 2017	Jul. 31, 2015	Jan. 31, 2018	Jan. 31, 2018	Mar. 31, 2017
Dow | Subsequent event
Subsequent Event [Line Items]
Number of shares authorized to be repurchased (in shares)	5,070,358
Percentage of number of shares outstanding	10.00%
Revolving loan
Subsequent Event [Line Items]
Maximum borrowing available		$ 25,000,000
Revolving loan | Dow
Subsequent Event [Line Items]
Rate of tax receivable agreement		85.00%
Revolving loan | Dow | Subsequent event
Subsequent Event [Line Items]
Maximum borrowing available	$ 50,000,000
Amendment agreement | Dow | Subsequent event
Subsequent Event [Line Items]
Cash paid to related party	$ 10,000,000
Amendment agreement | Dow | Forecast | Subsequent event
Subsequent Event [Line Items]
Cash paid to related party			$ 10,000,000	$ 20,000,000
Working capital adjustment | Dow
Subsequent Event [Line Items]
Outstanding payable					$ 17,000,000
Value added tax reimbursement | Dow
Subsequent Event [Line Items]
Outstanding payable					9,300,000
Tax amortization benefit contingency | Dow | Subsequent event
Subsequent Event [Line Items]
Rate of tax receivable agreement	50.00%
Tax amortization benefit contingency | Dow
Subsequent Event [Line Items]
Outstanding payable					$ 12,000,000