Consolidating Financial Information of Guarantors and Issuers Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 25, 2018	Mar. 26, 2017	Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Net revenues	$ 54,727	$ 48,318
Costs and expenses:
Cost of food, merchandise, and games revenues	6,003	5,480
Operating expenses	88,828	84,289
Selling, general and administrative	28,682	27,619
Depreciation and amortization	5,521	5,365
Loss on impairment / retirement of fixed assets, net	1,340	1,526
Total costs and expenses	130,374	124,279
Operating loss	(75,647)	(75,961)
Interest expense (income), net	19,536	18,882
Net effect of swaps	(3,628)	301
Loss on early debt extinguishment	1,073	0	$ 23,100
(Gain) loss on foreign currency	10,094	(2,671)
Other (income) expense	(123)	0
(Income) loss from investment in affiliates	0	0
Loss before taxes	(102,599)	(92,473)
Provision for taxes	(19,199)	(27,719)
Net loss	(83,400)	(64,754)
Other comprehensive income, (net of tax):
Foreign currency translation adjustment	4,604	(660)
Unrealized gain on cash flow hedging derivatives	2,018	1,994
Other comprehensive income, (net of tax)	6,622	1,334
Total comprehensive loss	(76,778)	(63,420)
June 2014 Notes [Member]
Condensed Financial Statements, Captions [Line Items]
Net revenues	54,727	48,318
Costs and expenses:
Cost of food, merchandise, and games revenues	6,003	5,480
Operating expenses	88,828	84,289
Selling, general and administrative	28,682	27,619
Depreciation and amortization	5,521	5,365
Loss on impairment / retirement of fixed assets, net	1,340	1,526
Total costs and expenses	130,374	124,279
Operating loss	(75,647)	(75,961)
Interest expense (income), net	19,536	18,882
Net effect of swaps	(3,628)	301
Loss on early debt extinguishment	1,073
(Gain) loss on foreign currency	10,094	(2,671)
Other (income) expense	(123)	0
(Income) loss from investment in affiliates	0	0
Loss before taxes	(102,599)	(92,473)
Provision for taxes	(19,199)	(27,719)
Net loss	(83,400)	(64,754)
Other comprehensive income, (net of tax):
Foreign currency translation adjustment	4,604	(660)
Unrealized gain on cash flow hedging derivatives	2,018	1,994
Other comprehensive income, (net of tax)	6,622	1,334
Total comprehensive loss	(76,778)	(63,420)
June 2014 Notes [Member] | Reportable Legal Entities [Member] | Cedar Fair L.P. (Parent) [Member]
Condensed Financial Statements, Captions [Line Items]
Net revenues	(10,767)	(6,138)
Costs and expenses:
Cost of food, merchandise, and games revenues	0	0
Operating expenses	0	0
Selling, general and administrative	759	894
Depreciation and amortization	0	0
Loss on impairment / retirement of fixed assets, net	0	0
Total costs and expenses	759	894
Operating loss	(11,526)	(7,032)
Interest expense (income), net	4,904	8,169
Net effect of swaps	(2,207)	150
Loss on early debt extinguishment	0
(Gain) loss on foreign currency	0	0
Other (income) expense	59	62
(Income) loss from investment in affiliates	68,528	48,666
Loss before taxes	(82,810)	(64,079)
Provision for taxes	590	675
Net loss	(83,400)	(64,754)
Other comprehensive income, (net of tax):
Foreign currency translation adjustment	4,604	(660)
Unrealized gain on cash flow hedging derivatives	2,018	1,994
Other comprehensive income, (net of tax)	6,622	1,334
Total comprehensive loss	(76,778)	(63,420)
June 2014 Notes [Member] | Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net revenues	49,787	45,296
Costs and expenses:
Cost of food, merchandise, and games revenues	6,003	5,480
Operating expenses	25,859	29,295
Selling, general and administrative	12,793	11,484
Depreciation and amortization	5,513	5,355
Loss on impairment / retirement of fixed assets, net	1,300	1,081
Total costs and expenses	51,468	52,695
Operating loss	(1,681)	(7,399)
Interest expense (income), net	4,682	(500)
Net effect of swaps	0	0
Loss on early debt extinguishment	886
(Gain) loss on foreign currency	0	0
Other (income) expense	8,768	14,545
(Income) loss from investment in affiliates	20,585	11,097
Loss before taxes	(36,602)	(32,541)
Provision for taxes	(3,876)	(7,599)
Net loss	(32,726)	(24,942)
Other comprehensive income, (net of tax):
Foreign currency translation adjustment	0	0
Unrealized gain on cash flow hedging derivatives	0	0
Other comprehensive income, (net of tax)	0	0
Total comprehensive loss	(32,726)	(24,942)
June 2014 Notes [Member] | Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net revenues	14,582	9,098
Costs and expenses:
Cost of food, merchandise, and games revenues	0	0
Operating expenses	14,582	9,098
Selling, general and administrative	0	0
Depreciation and amortization	0	0
Loss on impairment / retirement of fixed assets, net	0	0
Total costs and expenses	14,582	9,098
Operating loss	0	0
Interest expense (income), net	0	0
Net effect of swaps	0	0
Loss on early debt extinguishment	0
(Gain) loss on foreign currency	0	0
Other (income) expense	0	0
(Income) loss from investment in affiliates	(121,841)	(84,711)
Loss before taxes	121,841	84,711
Provision for taxes	0	0
Net loss	121,841	84,711
Other comprehensive income, (net of tax):
Foreign currency translation adjustment	(4,604)	660
Unrealized gain on cash flow hedging derivatives	(630)	(605)
Other comprehensive income, (net of tax)	(5,234)	55
Total comprehensive loss	116,607	84,766
April 2017 Notes [Member] | Reportable Legal Entities [Member] | Cedar Fair L.P. (Parent) [Member]
Condensed Financial Statements, Captions [Line Items]
Net revenues	(10,767)	(6,138)
Costs and expenses:
Cost of food, merchandise, and games revenues	0	0
Operating expenses	0	0
Selling, general and administrative	759	894
Depreciation and amortization	0	0
Loss on impairment / retirement of fixed assets, net	0	0
Total costs and expenses	759	894
Operating loss	(11,526)	(7,032)
Interest expense (income), net	4,904	8,169
Net effect of swaps	(2,207)	150
Loss on early debt extinguishment	0
(Gain) loss on foreign currency	0	0
Other (income) expense	59	62
(Income) loss from investment in affiliates	68,528	48,666
Loss before taxes	(82,810)	(64,079)
Provision for taxes	590	675
Net loss	(83,400)	(64,754)
Other comprehensive income, (net of tax):
Foreign currency translation adjustment	4,604	(660)
Unrealized gain on cash flow hedging derivatives	2,018	1,994
Other comprehensive income, (net of tax)	6,622	1,334
Total comprehensive loss	(76,778)	(63,420)
April 2017 Notes [Member] | Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net revenues	1,706	3,782
Costs and expenses:
Cost of food, merchandise, and games revenues	104	167
Operating expenses	8,889	8,441
Selling, general and administrative	1,150	591
Depreciation and amortization	5,513	5,355
Loss on impairment / retirement of fixed assets, net	649	585
Total costs and expenses	16,305	15,139
Operating loss	(14,599)	(11,357)
Interest expense (income), net	(6,871)	(3,922)
Net effect of swaps	0	0
Loss on early debt extinguishment	0
(Gain) loss on foreign currency	0	0
Other (income) expense	8,768	14,545
(Income) loss from investment in affiliates	20,585	11,097
Loss before taxes	(37,081)	(33,077)
Provision for taxes	(4,355)	(8,135)
Net loss	(32,726)	(24,942)
Other comprehensive income, (net of tax):
Foreign currency translation adjustment	0	0
Unrealized gain on cash flow hedging derivatives	0	0
Other comprehensive income, (net of tax)	0	0
Total comprehensive loss	(32,726)	(24,942)
April 2017 Notes [Member] | Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net revenues	8,932	3,634
Costs and expenses:
Cost of food, merchandise, and games revenues	0	0
Operating expenses	8,932	3,634
Selling, general and administrative	0	0
Depreciation and amortization	0	0
Loss on impairment / retirement of fixed assets, net	0	0
Total costs and expenses	8,932	3,634
Operating loss	0	0
Interest expense (income), net	0	0
Net effect of swaps	0	0
Loss on early debt extinguishment	0
(Gain) loss on foreign currency	0	0
Other (income) expense	0	0
(Income) loss from investment in affiliates	(121,841)	(84,711)
Loss before taxes	121,841	84,711
Provision for taxes	0	0
Net loss	121,841	84,711
Other comprehensive income, (net of tax):
Foreign currency translation adjustment	(4,604)	660
Unrealized gain on cash flow hedging derivatives	(630)	(605)
Other comprehensive income, (net of tax)	(5,234)	55
Total comprehensive loss	116,607	84,766
Co-Issuer Subsidiary (Magnum) [Member] | June 2014 Notes [Member] | Reportable Legal Entities [Member] | Subsidiary Issuer [Member]
Condensed Financial Statements, Captions [Line Items]
Net revenues	854	(291)
Costs and expenses:
Cost of food, merchandise, and games revenues	0	0
Operating expenses	42,671	40,592
Selling, general and administrative	14,450	14,495
Depreciation and amortization	8	8
Loss on impairment / retirement of fixed assets, net	0	0
Total costs and expenses	57,129	55,095
Operating loss	(56,275)	(55,386)
Interest expense (income), net	4,367	5,308
Net effect of swaps	(1,421)	151
Loss on early debt extinguishment	187
(Gain) loss on foreign currency	(41)	0
Other (income) expense	(9,804)	(15,264)
(Income) loss from investment in affiliates	28,815	20,604
Loss before taxes	(78,378)	(66,185)
Provision for taxes	(9,851)	(17,519)
Net loss	(68,527)	(48,666)
Other comprehensive income, (net of tax):
Foreign currency translation adjustment	0	0
Unrealized gain on cash flow hedging derivatives	630	605
Other comprehensive income, (net of tax)	630	605
Total comprehensive loss	(67,897)	(48,061)
Co-Issuer Subsidiary (Magnum) [Member] | April 2017 Notes [Member] | Reportable Legal Entities [Member] | Subsidiary Issuer [Member]
Condensed Financial Statements, Captions [Line Items]
Net revenues	854	(291)
Costs and expenses:
Cost of food, merchandise, and games revenues	0	0
Operating expenses	42,671	40,592
Selling, general and administrative	14,450	14,495
Depreciation and amortization	8	8
Loss on impairment / retirement of fixed assets, net	0	0
Total costs and expenses	57,129	55,095
Operating loss	(56,275)	(55,386)
Interest expense (income), net	4,367	5,308
Net effect of swaps	(1,421)	151
Loss on early debt extinguishment	187
(Gain) loss on foreign currency	(41)	0
Other (income) expense	(9,804)	(15,264)
(Income) loss from investment in affiliates	28,815	20,604
Loss before taxes	(78,378)	(66,185)
Provision for taxes	(9,851)	(17,519)
Net loss	(68,527)	(48,666)
Other comprehensive income, (net of tax):
Foreign currency translation adjustment	0	0
Unrealized gain on cash flow hedging derivatives	630	605
Other comprehensive income, (net of tax)	630	605
Total comprehensive loss	(67,897)	(48,061)
Co-Issuer Subsidiary (Cedar Canada) [Member] | June 2014 Notes [Member] | Reportable Legal Entities [Member] | Subsidiary Issuer [Member]
Condensed Financial Statements, Captions [Line Items]
Net revenues	271	353
Costs and expenses:
Cost of food, merchandise, and games revenues	0	0
Operating expenses	5,716	5,304
Selling, general and administrative	680	746
Depreciation and amortization	0	2
Loss on impairment / retirement of fixed assets, net	40	445
Total costs and expenses	6,436	6,497
Operating loss	(6,165)	(6,144)
Interest expense (income), net	5,583	5,905
Net effect of swaps	0	0
Loss on early debt extinguishment	0
(Gain) loss on foreign currency	10,135	(2,671)
Other (income) expense	854	657
(Income) loss from investment in affiliates	3,913	4,344
Loss before taxes	(26,650)	(14,379)
Provision for taxes	(6,062)	(3,276)
Net loss	(20,588)	(11,103)
Other comprehensive income, (net of tax):
Foreign currency translation adjustment	4,604	(660)
Unrealized gain on cash flow hedging derivatives	0	0
Other comprehensive income, (net of tax)	4,604	(660)
Total comprehensive loss	(15,984)	(11,763)
Co-Issuer Subsidiary (Cedar Canada) [Member] | April 2017 Notes [Member] | Reportable Legal Entities [Member] | Subsidiary Issuer [Member]
Condensed Financial Statements, Captions [Line Items]
Net revenues	271	353
Costs and expenses:
Cost of food, merchandise, and games revenues	0	0
Operating expenses	5,716	5,304
Selling, general and administrative	680	746
Depreciation and amortization	0	2
Loss on impairment / retirement of fixed assets, net	40	445
Total costs and expenses	6,436	6,497
Operating loss	(6,165)	(6,144)
Interest expense (income), net	5,583	5,905
Net effect of swaps	0	0
Loss on early debt extinguishment	0
(Gain) loss on foreign currency	10,135	(2,671)
Other (income) expense	854	657
(Income) loss from investment in affiliates	3,913	4,344
Loss before taxes	(26,650)	(14,379)
Provision for taxes	(6,062)	(3,276)
Net loss	(20,588)	(11,103)
Other comprehensive income, (net of tax):
Foreign currency translation adjustment	4,604	(660)
Unrealized gain on cash flow hedging derivatives	0	0
Other comprehensive income, (net of tax)	4,604	(660)
Total comprehensive loss	(15,984)	(11,763)
Co-Issuer Subsidiary (Millennium) [Member] | April 2017 Notes [Member] | Reportable Legal Entities [Member] | Subsidiary Issuer [Member]
Condensed Financial Statements, Captions [Line Items]
Net revenues	53,731	46,978
Costs and expenses:
Cost of food, merchandise, and games revenues	5,899	5,313
Operating expenses	22,620	26,318
Selling, general and administrative	11,643	10,893
Depreciation and amortization	0	0
Loss on impairment / retirement of fixed assets, net	651	496
Total costs and expenses	40,813	43,020
Operating loss	12,918	3,958
Interest expense (income), net	11,553	3,422
Net effect of swaps	0	0
Loss on early debt extinguishment	886
(Gain) loss on foreign currency	0	0
Other (income) expense	0	0
(Income) loss from investment in affiliates	0	0
Loss before taxes	479	536
Provision for taxes	479	536
Net loss	0	0
Other comprehensive income, (net of tax):
Foreign currency translation adjustment	0	0
Unrealized gain on cash flow hedging derivatives	0	0
Other comprehensive income, (net of tax)	0	0
Total comprehensive loss	$ 0	$ 0