Commitments and Contingencies -Additional information (Details) - $ / shares |
9 Months Ended | 21 Months Ended | |||
|---|---|---|---|---|---|
Jan. 09, 2018 |
Jun. 30, 2019 |
Jun. 30, 2019 |
Sep. 30, 2018 |
Dec. 12, 2017 |
|
| Commitments And Contingencies [Line Items] | |||||
| Underwriters option period | 45 days | ||||
| Sale price per unit | $ 10.00 | $ 10.00 | $ 10.00 | $ 10.00 | |
| Paid an underwriting discount | $ 0.20 | ||||
| Business combination marketing agreement, advisors fee percentage description | Pursuant to that agreement, the Company will pay the Advisors a cash fee for such services upon the consummation of the Business Combination in an amount equal to, in the aggregate, (i) 3.5% of the gross proceeds of the Offering, excluding any proceeds from the full or partial exercise of the over-allotment option, plus (ii) 5.033333% of the gross proceeds of the Offering, if any, from the full or partial exercise of the over-allotment option (in each case, exclusive of any applicable finders’ fees which might become payable). | ||||
| Advisors fee on gross proceeds of offering excluding over-allotment option percentage | 3.50% | 3.50% | |||
| Advisors fee on gross proceeds of offering including over-allotment option percentage | 5.03333% | 5.03333% | |||
| Over-Allotment Option | |||||
| Commitments And Contingencies [Line Items] | |||||
| Number of additional shares granted | 1,875,000 | ||||
| Number of additional units purchased by underwriters | 1,875,000 | ||||
| Sale price per unit | $ 10.00 | ||||
| Paid an underwriting discount | $ 0.0467 |