Business Operations (Details) (USD $)	1 Months Ended			9 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Feb. 29, 2012	Sep. 30, 2013 agent subsidiary outlet sqft room	Jul. 02, 2013	Feb. 28, 2013 sqft item	Mar. 31, 2002
Business Operations
Area of casino (in square feet)				165,000
Number of retail outlets				4
Number of rooms in AAA Four Diamond hotel				500
Number of seats in sports-themed restaurant						110
Area of leased property (in square feet)						4,100
Number of wholly owned subsidiaries				2
Percentage of the issued and outstanding common stock of Dover Downs, Inc. contributed by DVD							100.00%
Percentage of issued and outstanding common stock distributed to parent stockholders							100.00%
Number of Licensed Agents under Delaware State Lottery Code				3
Number of consecutive years for which annual license has been received from the Harness Racing Commission				44 years
State-wide net proceeds to be retained in lottery				$ 3,750,000
Gaming license fee paid			1,540,000
Table game license fee paid	1,017,000	2,241,000
Business operations
Amount appropriated to Department of Finance under a bond and capital improvements bill					$ 8,000,000
Total gaming win | Geographic concentration risk | Maryland patrons
Business operations
Estimated percentage of gaming win attributable to patrons				31.00%
Capital Club member gaming win | Geographic concentration risk | Out of state patrons
Business operations
Estimated percentage of gaming win attributable to patrons				66.00%