Revision of Prior Year Immaterial Misstatement - Summary of Consolidated Financial Statements (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended					6 Months Ended		12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2019	Mar. 31, 2018	Sep. 30, 2018	Sep. 30, 2017
Other charges, net								$ 9,184
Total operating expenses	$ 33,660			$ 32,995		$ 66,551	$ 65,067	138,186
Income from operations	11,166		$ 699	8,231		22,298	17,371	27,562
Income before income taxes	8,673			6,193		16,888	12,321	17,842
Net income	6,743	$ 6,404		4,694	$ 14,355	13,147	19,049	20,960
Net income attributable to RCIHH common stockholders	6,735		$ (3,506)	4,685		13,079	18,996	$ 20,879
Earnings (loss) per share - basic			$ (0.36)					$ 2.15
Earnings (loss) per share - diluted			$ (0.36)					$ 2.15
Comprehensive income								$ 21,180
Comprehensive income attributable to RCI Hospitality Holdings, Inc.								21,099
Goodwill	55,271		$ 43,591			55,271		43,591
Total assets	350,873		329,732			350,873		329,732
Retained earnings	101,623		88,906			101,623		88,906
Total RCIHH stockholders' equity	163,971		153,435			163,971		153,435
Total stockholders' equity	163,936	$ 159,090	153,332	$ 153,583	$ 149,234	163,936	$ 153,583	153,332	$ 135,225
Total liabilities and stockholders' equity	$ 350,873		329,732			$ 350,873		329,732
Previously Reported [Member]
Other charges, net								8,350
Total operating expenses								137,352
Income from operations			1,533					28,396
Income before income taxes								18,676
Net income								21,794
Net income attributable to RCIHH common stockholders			$ (2,672)					$ 21,713
Earnings (loss) per share - basic			$ (0.27)					$ 2.23
Earnings (loss) per share - diluted			$ (0.27)					$ 2.23
Comprehensive income								$ 22,014
Comprehensive income attributable to RCI Hospitality Holdings, Inc.								21,933
Goodwill			$ 44,425					44,425
Total assets			330,566					330,566
Retained earnings			89,740					89,740
Total RCIHH stockholders' equity			154,269					154,269
Total stockholders' equity			154,166					154,166
Total liabilities and stockholders' equity			330,566					330,566
Adjustment [Member]
Other charges, net								834
Total operating expenses								834
Income from operations			(834)					(834)
Income before income taxes								(834)
Net income								(834)
Net income attributable to RCIHH common stockholders			$ (834)					$ (834)
Earnings (loss) per share - basic			$ (0.09)					$ (0.08)
Earnings (loss) per share - diluted			$ (0.09)					$ (0.08)
Comprehensive income								$ (834)
Comprehensive income attributable to RCI Hospitality Holdings, Inc.								(834)
Goodwill			$ (834)					(834)
Total assets			(834)					(834)
Retained earnings			(834)					(834)
Total RCIHH stockholders' equity			(834)					(834)
Total stockholders' equity			(834)					(834)
Total liabilities and stockholders' equity			$ (834)					$ (834)