Stockholders' (Deficit) Equity (Details) - USD ($)								3 Months Ended						12 Months Ended			27 Months Ended	39 Months Ended
	Feb. 14, 2018	Oct. 06, 2017	Jul. 07, 2017	Apr. 07, 2017	Jan. 07, 2017	Jan. 08, 2016	Jan. 09, 2015	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2017	Oct. 01, 2015	Oct. 31, 2014
Class of Stock [Line Items]
Purchase of DineEquity common stock (shares)														145,786	650,384	721,463.000
Repurchase of Dine Brands Global common stock														$ (10,003,000)	$ (55,343,000)	$ (70,014,000)
Remaining authorized repurchase amount														$ 67,100,000			$ 67,100,000	$ 67,100,000
Dividends paid per common share (USD per share)		$ 0.97	$ 0.97	$ 0.97	$ 0.97	$ 0.920	$ 0.875	$ 0.920	$ 0.920	$ 0.920	$ 0.875	$ 0.875	$ 0.875	$ 3.88	$ 3.68	$ 3.5
Reissuance of treasury stock														$ 2,635,000	$ 1,409,000	$ 9,536,000
Treasury Stock
Class of Stock [Line Items]
Purchase of DineEquity common stock (shares)														146,000	650,000	722,000
Reissuance of treasury stock (shares)														(281,000)	(137,000)	(357,000)
Reissuance of treasury stock														$ 10,113,000	$ 4,877,000	$ 12,913,000
2014 Authorization
Class of Stock [Line Items]
Authorized amount																				$ 100,000,000
Purchase of DineEquity common stock (shares)														0	0	516,976		537,311
Repurchase of Dine Brands Global common stock														$ 0	$ 0	$ (52,500,000)		$ (54,500,000)
2015 Authorization
Class of Stock [Line Items]
Authorized amount														$ 67,100,000			$ 67,100,000	$ 67,100,000	$ 150,000,000
Purchase of DineEquity common stock (shares)														145,786	650,384	204,487	1,000,657
Repurchase of Dine Brands Global common stock														$ (10,000,000)	$ (55,300,000)	$ (17,500,000)	$ (72,878,284.85)
Subsequent Event
Class of Stock [Line Items]
Dividends paid per common share (USD per share)	$ 0.63