| Cover | Nov. 24, 2021 |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Nov. 24, 2021 |
| Entity File Number | 001-39959 |
| Entity Registrant Name | GROWTH CAPITAL ACQUISITION CORP. |
| Entity Central Index Key | 0001498233 |
| Entity Tax Identification Number | 27-2447291 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 300 Park Avenue |
| Entity Address, Address Line Two | 16th Floor |
| Entity Address, City or Town | New York |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 10022 |
| City Area Code | 212 |
| Local Phone Number | 895-3500 |
| Written Communications | true |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | false |
| Units, each consisting of one share of Class A common stock and one-half of one Redeemable Warrant | |
| Title of 12(b) Security | Units, each consisting of one share of Class A common stock and one-half of one Redeemable Warrant |
| Trading Symbol | GCACU |
| Security Exchange Name | NASDAQ |
| Class A common stock, par value $0.0001 per share | |
| Title of 12(b) Security | Class A common stock, par value $0.0001 per share |
| Trading Symbol | GCAC |
| Security Exchange Name | NASDAQ |
| Redeemable warrants, exercisable for Class A common stock at an exercise price of $11.50 per share | |
| Title of 12(b) Security | Redeemable warrants, exercisable for Class A common stock at an exercise price of $11.50 per share |
| Trading Symbol | GCACW |
| Security Exchange Name | NASDAQ |
