Document and Entity Information [Abstract] Document Type Entity Registrant Name Entity Filer Category Entity Small Business Entity Emerging Growth Company Entity Ex Transition Period Entity Central Index Key Amendment Flag Represents information pertaining to Graf Industrial II Sponsor, LLC. Graf Industrial II Sponsor, LLC [Member] Graf Industrial II Sponsor, LLC Represents information pertaining to G-SPAC Management LLC, an affiliate. G-SPAC Management LLC, Affiliate [Member] G-SPAC Management LLC, an affiliate of our sponsor Represents information pertaining to Graf Industrial II Sponsor, LLC, or Affiliates, Officers and Directors. Graf Industrial II Sponsor, LLC, or Affiliates, Officers and Directors [Member] Graf Industrial II Sponsor, LLC, or Affiliates, Officers and Directors Represents information pertaining to monthly office space and administrative expenses. Monthly Office Space And Administrative Expenses [Member] Represents information pertaining to loans made for offering and organizational expenses. Loans Made for Offering And Organizational Expenses [Member] Represents information pertaining to Loans made to Finance Transactions. Loans Made to Finance Transaction Costs [Member] Represents information pertaining to Out-of-Pocket expenses. Any Out-of-Pocket Expenses [Member] Represents information pertaining to offering costs accrued or paid in advance. Offering Costs Accrued Or Paid In Advance [Member] Represents information pertaining to James A Graf. James Agraf [Member] Represents information pertaining to all executive officers, directors and director nominees. All Executive Officers, Directors and Director Nominees [Member] Represents information pertaining to Louis Belanger Martin. Louis Belanger Martin [Member] Represents information pertaining to Kenneth Weinstein. Kenneth Weinstein [Member] Represents information pertaining to Fred Zeidman. Fred Zeidman [Member] Represents information pertaining to M. Klein and Company, LLC. M. Klein and Company, LLC [Member] Represents information pertaining to M.Klein & Company LLC. M.Klein & Company LLC [Member] Represents information pertaining to private placement warrant. Private Placement Warrant [Member]