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Reconciliation Between basic and Diluted Net Income Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Apr. 30, 2013	Apr. 30, 2012
Schedule Of Computation Of Basic And Diluted Earnings Per Common Share [Line Items]
Net income (loss) attributable to G-III	$ 1,118	$ (847)
Basic net income (loss) per share:
Basic common shares	20,161	19,860
Basic net income (loss) per share	$ 0.06	$ (0.04)
Diluted net income (loss) per share:
Basic common shares	20,161	19,860
Stock options and restricted stock awards	241
Diluted common shares	20,402	19,860
Diluted net income (loss) per share	$ 0.05	$ (0.04)

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