Quarterly Information (Unaudited) (Details) $ / shares in Units, € in Millions	1 Months Ended		3 Months Ended										6 Months Ended	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2018 EUR (€)	Feb. 01, 2020 USD ($) $ / shares	Nov. 02, 2019 USD ($) $ / shares	Aug. 03, 2019 USD ($) $ / shares	May 04, 2019 USD ($) $ / shares	Feb. 02, 2019 USD ($) $ / shares	Feb. 02, 2019 EUR (€)	Nov. 03, 2018 USD ($) $ / shares	Nov. 03, 2018 EUR (€)	Aug. 04, 2018 USD ($) $ / shares	May 05, 2018 USD ($) $ / shares	Aug. 04, 2018	Feb. 01, 2020 USD ($) $ / shares	Feb. 02, 2019 USD ($) $ / shares	Feb. 02, 2019 EUR (€)	Feb. 03, 2018 USD ($) $ / shares	Apr. 30, 2019 USD ($)
Summary of the unaudited quarterly financial information
Net revenue			$ 842,254,000	$ 615,944,000	$ 683,220,000	$ 536,691,000	$ 837,127,000		$ 605,407,000		$ 645,871,000	$ 521,289,000
Gross profit			338,594,000	229,499,000	265,666,000	181,949,000	306,092,000		220,143,000		239,431,000	173,938,000		$ 1,015,708,000	$ 939,604,000		$ 828,848,000
Net earnings (loss)			82,049,000	13,585,000	26,176,000	(20,581,000)	25,235,000		(12,816,000)		25,734,000	(20,987,000)		101,229,000	17,166,000		(3,901,000)
Net earnings (loss) attributable to Guess, Inc.			$ 79,604,000	$ 12,423,000	$ 25,322,000	$ (21,374,000)	$ 23,232,000		$ (13,442,000)		$ 25,530,000	$ (21,221,000)		$ 95,975,000	$ 14,099,000		$ (7,894,000)
Net earnings (loss) per common share attributable to common stockholders:
Basic (in dollars per share) | $ / shares			$ 1.21	$ 0.19	$ 0.36	$ (0.27)	$ 0.29		$ (0.17)		$ 0.32	$ (0.27)		$ 1.35	$ 0.17		$ (0.11)
Diluted (in dollars per share) | $ / shares			$ 1.18	$ 0.18	$ 0.35	$ (0.27)	$ 0.28		$ (0.17)		$ 0.31	$ (0.27)		$ 1.33	$ 0.16		$ (0.11)
Selected quarterly financial information
Fiscal period duration			91 days	91 days	91 days	91 days	91 days	91 days	91 days	91 days		91 days	91 days	364 days	364 days	364 days	371 days
Professional service and legal costs and related (credits) costs			$ (100,000)	$ (1,400,000)	$ 400,000	$ 300,000	$ 200,000		$ 100,000		$ 2,000,000.0	$ 3,800,000
Net gains (losses) on lease terminations							(300,000)		0		0	(200,000)		$ 0	$ (477,000)		$ 11,373,000
Asset impairment charges			4,900,000	$ 1,800,000	$ 1,500,000	$ 1,800,000	1,900,000		1,300,000		$ 3,000,000.0	$ 700,000		7,546,000	6,939,000
European Commission fine	$ 45,600,000	€ 39.8					3,200,000	€ 2.8	42,400,000	€ 37.0				$ 0	$ 45,637,000	€ 39.8	$ 0
Change in estimate related to U.S. Tax Reform							25,800,000		$ (19,600,000)
CEO
Selected quarterly financial information
Separation charges							5,200,000
Cash related severance payments							2,400,000
Non-cash stock-based compensation expenses			$ 400,000				$ 2,800,000
Senior Notes | 2.00% Convertible Senior Notes Due 2024
Selected quarterly financial information
Convertible debt issued																		$ 300,000,000