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SIGNIFICANT ACCOUNTING POLICIES (Detail Textuals) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Apr. 01, 2015 | Jan. 31, 2018 | Jan. 31, 2017 | Jan. 31, 2016 | Dec. 31, 2017
Accounting Policies [Line Items] |  |  |  |  |
Impairment charge with respect to leasehold improvements and furniture and fixture |  | $ 7,884,000 | $ 10,480,000 |  |
Goodwill written off |  | $ 716,000 |  |  |
Additional diluted common shares included in diluted net income per share |  | 930,000 | 1,086,000 | 1,184,000 |
Selling, general and administrative expenses |  | $ 855,247,000 | $ 704,436,000 | $ 628,762,000 |
Retained earnings |  | $ 674,542,000 | $ 612,418,000 |  |
Stock split of common stock | two-for-one |  |  |  |
Anti-dilutive shares excluded from diluted net income per share calculation |  | 466,000 | 384,000 | 165,000 |
Common stock issued in connection with exercise or vesting of equity awards |  | 201,968 | 194,618 | 270,630 |
Treasury shares re-issued in connection with the exercise or vesting of equity awards |  | 270,083 | 291,181 |  |
Prepaid advertising |  | $ 9,700,000 | $ 7,800,000 |  |
Percentage of estimated forfeiture rate for equity award compensation |  | 0.00% |  |  |
Kingdom Holding 1 BV ("KH1") |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Percentage of ownership interest (G III owns) |  | 19.00% |  |  |
Furniture and fixtures | Wilsons, G H Bass And Vilebrequin Stores |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Impairment charge with respect to leasehold improvements and furniture and fixture |  | $ 6,500,000 | 10,500,000 |  |
Furniture and fixtures | Bon Ton Stores |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Impairment charge with respect to leasehold improvements and furniture and fixture |  | $ 738,000 |  |  |
LVMH Note |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Debt instrument interest rate |  | 2.00% |  |  |
Debt discount |  | $ 40,000,000 |  |  |
Effects of Recently Issued Accounting Pronouncements |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Additional diluted common shares included in diluted net income per share |  | 207,000 |  |  |
ASU 2014-09 |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Cooperative advertising |  | $ 28,200,000 |  |  |
KL North America BV ("KLNA") | Equity method of accounting |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Percentage of ownership interest (G III owns) |  | 49.00% |  |  |
Wholesale shipping and handling costs |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Selling, general and administrative expenses |  | $ 120,200,000 | $ 99,100,000 | $ 83,000,000 |
Minimum |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Intangible assets, estimated useful lives |  | 5 years |  |  |
Minimum | ASU 2014-09 |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Retained earnings |  |  |  |  | $ 39,000,000
Minimum | Restricted Stock Units (RSUs) | Long-Term Incentive Stock Plan |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Vesting and exercise period of awards |  | 3 years |  |  |
Maximum |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Intangible assets, estimated useful lives |  | 17 years |  |  |
Maximum | ASU 2014-09 |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Retained earnings |  |  |  |  | $ 45,000,000
Maximum | Restricted Stock Units (RSUs) | Long-Term Incentive Stock Plan |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Vesting and exercise period of awards |  | 5 years |  |  |
Maximum | Stock Options |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Vesting and exercise period of awards |  | 10 years |  |  |

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