Public Offering	6 Months Ended
Jun. 30, 2017
Text Block [Abstract]
Public Offering	Note 3—Public Offering In April 2017, the Company closed its Public Offering of 37,732,112 units at a price of $10.00 per unit (the “Units”), with gross proceeds of $377,321,120 from the sale of Units. The closings occurred on April 4, 2017 with respect to 35,000,000 Units and on April 21, 2017 with respect to 2,732,112 Units related to the partial exercise of the underwriters’ over-allotment option. Each Unit consists of one share of the Company’s Class A Common Stock, and one-third of one warrant (each, a “Warrant” and, collectively, the “Warrants”). Each whole Warrant entitles the holder to purchase one share of Class A Common Stock at a price of $11.50 per share. Each Warrant will become exercisable on the later of 30 days after the completion of the Company’s Initial Business Combination or 12 months from the closing of the Public Offering, and will expire five years after the completion of the Company’s Initial Business Combination or earlier upon redemption or liquidation. Once the Warrants become exercisable, the Company may redeem the outstanding Warrants in whole and not in part at a price of $0.01 per Warrant upon a minimum of 30 days’ prior written notice of redemption, if and only if the last sale price of the Company’s Class A Common Stock equals or exceeds $18.00 per share for any 20 trading days within a 30-trading day period ending on the third trading day prior to the date on which the Company sent the notice of redemption to the Warrant holders. Commencing on April 27, 2017, the holders of Units issued in its Public Offering may elect to separately trade shares of Class A Common Stock and Warrants included in the Units. The Units not separated will continue to trade on The Nasdaq Capital Market under the symbol “KAACU.” Shares of Class A Common Stock and the Warrants are trading on The Nasdaq Capital Market under the symbols “KAAC” and “KAACW,” respectively. No fractional warrants will be issued upon separation of the Units and only whole Warrants will trade. The Company paid an underwriting discount of 2.0% of the per Unit offering price (or $7,546,422) to the underwriters at the closing of the Public Offering, with an additional fee (the “Deferred Discount”) of 3.5% of the gross offering proceeds (or $13,206,239) payable upon the Company’s completion of an Initial Business Combination. The Deferred Discount will become payable to the underwriters from the amounts held in the Trust Account solely in the event the Company completes its Initial Business Combination. The Company granted the underwriters a 45-day option to purchase up to 5,250,000 additional Units to cover over-allotments, if any (“Over-Allotment Units”) at the initial public offering price less the underwriting discounts and commissions. The 2,732,112 Units issued in connection with the over-allotment option are identical to the Units issued in the Public Offering.

Note 3—Public Offering

In April 2017, the Company closed its Public Offering of 37,732,112 units at a price of $10.00 per unit (the “Units”), with gross proceeds of $377,321,120 from the sale of Units. The closings occurred on April 4, 2017 with respect to 35,000,000 Units and on April 21, 2017 with respect to 2,732,112 Units related to the partial exercise of the underwriters’ over-allotment option.

Each Unit consists of one share of the Company’s Class A Common Stock, and one-third of one warrant (each, a “Warrant” and, collectively, the “Warrants”). Each whole Warrant entitles the holder to purchase one share of Class A Common Stock at a price of $11.50 per share. Each Warrant will become exercisable on the later of 30 days after the completion of the Company’s Initial Business Combination or 12 months from the closing of the Public Offering, and will expire five years after the completion of the Company’s Initial Business Combination or earlier upon redemption or liquidation. Once the Warrants become exercisable, the Company may redeem the outstanding Warrants in whole and not in part at a price of $0.01 per Warrant upon a minimum of 30 days’ prior written notice of redemption, if and only if the last sale price of the Company’s Class A Common Stock equals or exceeds $18.00 per share for any 20 trading days within a 30-trading day period ending on the third trading day prior to the date on which the Company sent the notice of redemption to the Warrant holders.

Commencing on April 27, 2017, the holders of Units issued in its Public Offering may elect to separately trade shares of Class A Common Stock and Warrants included in the Units. The Units not separated will continue to trade on The Nasdaq Capital Market under the symbol “KAACU.” Shares of Class A Common Stock and the Warrants are trading on The Nasdaq Capital Market under the symbols “KAAC” and “KAACW,” respectively. No fractional warrants will be issued upon separation of the Units and only whole Warrants will trade.

The Company paid an underwriting discount of 2.0% of the per Unit offering price (or $7,546,422) to the underwriters at the closing of the Public Offering, with an additional fee (the “Deferred Discount”) of 3.5% of the gross offering proceeds (or $13,206,239) payable upon the Company’s completion of an Initial Business Combination. The Deferred Discount will become payable to the underwriters from the amounts held in the Trust Account solely in the event the Company completes its Initial Business Combination.

The Company granted the underwriters a 45-day option to purchase up to 5,250,000 additional Units to cover over-allotments, if any (“Over-Allotment Units”) at the initial public offering price less the underwriting discounts and commissions. The 2,732,112 Units issued in connection with the over-allotment option are identical to the Units issued in the Public Offering.