Going Concern (Details)	6 Months Ended
Jun. 30, 2022 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accumulated deficit	$ 44,400
Working capital	$ 44,400

Working capital, also known as net working capital (NWC), is the difference between a company’s current assets—such as cash, accounts receivable/customers’ unpaid bills, and inventories of raw materials and finished goods—and its current liabilities, such as accounts payable and debts. It's a commonly used measurement to gauge the short-term health of an organization.

No definition available.

Name:	grhi_WorkingCapital
Namespace Prefix:	grhi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration