Award Timing Disclosure	12 Months Ended
	Sep. 30, 2025
Award Timing Disclosures [Line Items]
Award Timing, How MNPI Considered	The Company has established a policy designed to prohibit officers, directors, and employees of the Company and GC Advisors from purchasing or selling securities of the Company while in possession of material nonpublic information, or otherwise using such information for their personal benefit or in any manner that would violate applicable laws and regulations.