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Operating Segments - Disclosure of Detailed Information About Segment Performance (Details) - NZD ($) $ in Thousands | 12 Months Ended
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Jan. 31, 2020 | Jan. 31, 2020 | Jan. 31, 2019 | Jan. 31, 2018
Statement Line Items [Line Items] |  |  |  |  |  |
Revenue |  |  | $ 90,065 |  | $ 111,920 | $ 131,388
Cost of sales |  |  | (56,247) |  | (74,480) | (87,459)
Gross margin |  |  | 33,818 |  | 37,440 | 43,929
Administrative expenses |  |  | (11,837) |  | (3,432) | (4,131)
Corporate expenses |  |  | (12,772) |  | (14,145) | (12,851)
Other foreign exchange gain/loss |  |  | (615) |  | (1,963) | (757)
EBITDA |  |  | (16,167) |  | (25,602) | (24,053)
Brand transition, restructure and transaction expenses |  |  | (14,593) |  | (10,075) | (3,272)
Finance expense |  |  | (5,213) |  | (4,041) | (8,791)
Fair value (gain)/loss on Convertible Note derivative |  |  |  |  | (775) | 2,393
(Income/(loss) before income tax expense |  |  | (53,523) |  | (50,494) | (37,533)
Income tax benefit |  |  | (782) |  | 1,274 | (60)
Loss for the period |  | $ (54,305) | (54,305) |  | (49,220) | (37,593)
Operating Segments [Member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Revenue from external customers |  |  | 90,065 |  | 111,920 | 131,286
Service income |  |  |  |  |  | 102
Revenue |  |  | 90,065 |  | 111,920 | 131,388
Cost of sales |  |  | (56,247) |  | (74,480) | (87,459)
Gross margin |  |  | 33,818 |  | 37,440 | 43,929
Other segment expenses | [2] |  | (35,555) | [1] | (45,454) | (47,354)
Administrative expenses |  |  | (1,234) |  | (1,050) | (1,101)
Corporate expenses |  |  | (12,772) |  | (17,947) | (19,150)
Other foreign exchange gain/loss |  |  | (424) |  | 1,409 | (377)
EBITDA |  |  | (16,167) |  | (25,602) | (24,053)
Brand transition, restructure and transaction expenses |  |  | (13,687) | [3] | (10,075) | (3,272)
Finance expense |  |  | (5,213) |  | (4,041) | (8,791)
Interest income |  |  | 12 |  |  |
Impairment expense |  |  | (8,904) |  | (8,173) | (1,914)
Depreciation and amortisation |  |  | (10,603) |  | (2,382) | (3,030)
Fair value gain/(loss) on foreign exchange contracts |  |  | 729 |  | (1,704) | (502)
Unrealised foreign exchange gain/(loss) |  |  | 310 |  | 2,258 | 1,636
Fair value (gain)/loss on Convertible Note derivative |  |  |  |  | (775) | 2,393
(Income/(loss) before income tax expense |  |  | (53,523) |  | (50,494) | (37,533)
Income tax benefit |  |  | (782) |  | 1,274 | (60)
Loss for the period |  |  | (54,305) |  | (49,220) | (37,593)
Operating Segments [Member] | New Zealand Retail [Member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Revenue from external customers |  |  | 28,302 |  | 31,801 | 34,269
Service income |  |  |  |  |  |
Revenue |  |  | 28,302 |  | 31,801 | 34,269
Cost of sales |  |  | (12,997) |  | (15,424) | (16,488)
Gross margin |  |  | 15,305 |  | 16,377 | 17,781
Other segment expenses | [2] |  | (10,491) | [1] | (13,537) | (13,451)
Administrative expenses |  |  |  |  |  |
Corporate expenses |  |  |  |  |  |
Other foreign exchange gain/loss |  |  |  |  |  |
EBITDA |  |  | 4,814 |  | 2,840 | 4,330
Brand transition, restructure and transaction expenses |  |  |  | [3] |  |
Finance expense |  |  |  |  |  |
Interest income |  |  |  |  |  |
Impairment expense |  |  |  |  |  |
Depreciation and amortisation |  |  |  |  |  |
Fair value gain/(loss) on foreign exchange contracts |  |  |  |  |  |
Unrealised foreign exchange gain/(loss) |  |  |  |  |  |
Fair value (gain)/loss on Convertible Note derivative |  |  |  |  |  |
(Income/(loss) before income tax expense |  |  | 4,814 |  | 2,840 | 4,330
Income tax benefit |  |  |  |  |  |
Loss for the period |  |  | 4,814 |  | 2,840 | 4,330
Operating Segments [Member] | Australia Retail [Member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Revenue from external customers |  |  | 14,274 |  | 18,547 | 18,236
Service income |  |  |  |  |  |
Revenue |  |  | 14,274 |  | 18,547 | 18,236
Cost of sales |  |  | (6,585) |  | (9,192) | (9,457)
Gross margin |  |  | 7,689 |  | 9,355 | 8,779
Other segment expenses | [2] |  | (8,293) | [1] | (11,003) | (11,329)
Administrative expenses |  |  |  |  |  |
Corporate expenses |  |  |  |  |  |
Other foreign exchange gain/loss |  |  |  |  |  |
EBITDA |  |  | (604) |  | (1,648) | (2,550)
Brand transition, restructure and transaction expenses |  |  |  | [3] |  |
Finance expense |  |  |  |  |  |
Interest income |  |  |  |  |  |
Impairment expense |  |  |  |  |  |
Depreciation and amortisation |  |  |  |  |  |
Fair value gain/(loss) on foreign exchange contracts |  |  |  |  |  |
Unrealised foreign exchange gain/(loss) |  |  |  |  |  |
Fair value (gain)/loss on Convertible Note derivative |  |  |  |  |  |
(Income/(loss) before income tax expense |  |  | (604) |  | (1,648) | (2,550)
Income tax benefit |  |  |  |  |  |
Loss for the period |  |  | (604) |  | (1,648) | (2,550)
Operating Segments [Member] | New Zealand Wholesale [Member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Revenue from external customers |  |  | 3,482 |  | 7,154 | 10,453
Service income |  |  |  |  |  |
Revenue |  |  | 3,482 |  | 7,154 | 10,453
Cost of sales |  |  | (3,455) |  | (6,372) | (8,213)
Gross margin |  |  | 27 |  | 782 | 2,240
Other segment expenses | [2] |  | (473) | [1] | (912) | (1,068)
Administrative expenses |  |  |  |  |  |
Corporate expenses |  |  |  |  |  |
Other foreign exchange gain/loss |  |  |  |  |  |
EBITDA |  |  | (446) |  | (130) | 1,172
Brand transition, restructure and transaction expenses |  |  |  | [3] |  |
Finance expense |  |  |  |  |  |
Interest income |  |  |  |  |  |
Impairment expense |  |  |  |  |  |
Depreciation and amortisation |  |  |  |  |  |
Fair value gain/(loss) on foreign exchange contracts |  |  |  |  |  |
Unrealised foreign exchange gain/(loss) |  |  |  |  |  |
Fair value (gain)/loss on Convertible Note derivative |  |  |  |  |  |
(Income/(loss) before income tax expense |  |  | (446) |  | (130) | 1,172
Income tax benefit |  |  |  |  |  |
Loss for the period |  |  | (446) |  | (130) | 1,172
Operating Segments [Member] | Australia Wholesale [Member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Revenue from external customers |  |  | 7,066 |  | 11,491 | 15,512
Service income |  |  |  |  |  |
Revenue |  |  | 7,066 |  | 11,491 | 15,512
Cost of sales |  |  | (4,837) |  | (8,498) | (12,545)
Gross margin |  |  | 2,229 |  | 2,993 | 2,967
Other segment expenses | [2] |  | (2,149) | [1] | (4,495) | (3,781)
Administrative expenses |  |  |  |  |  |
Corporate expenses |  |  |  |  |  |
Other foreign exchange gain/loss |  |  |  |  |  |
EBITDA |  |  | 80 |  | (1,502) | (814)
Brand transition, restructure and transaction expenses |  |  |  | [3] |  |
Finance expense |  |  |  |  |  |
Interest income |  |  |  |  |  |
Impairment expense |  |  |  |  |  |
Depreciation and amortisation |  |  |  |  |  |
Fair value gain/(loss) on foreign exchange contracts |  |  |  |  |  |
Unrealised foreign exchange gain/(loss) |  |  |  |  |  |
Fair value (gain)/loss on Convertible Note derivative |  |  |  |  |  |
(Income/(loss) before income tax expense |  |  | 80 |  | (1,502) | (814)
Income tax benefit |  |  |  |  |  |
Loss for the period |  |  | 80 |  | (1,502) | (814)
Operating Segments [Member] | US Wholesale [Member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Revenue from external customers |  |  | 3,955 |  | 5,798 | 6,390
Service income |  |  |  |  |  |
Revenue |  |  | 3,955 |  | 5,798 | 6,390
Cost of sales |  |  | (2,265) |  | (5,222) | (6,438)
Gross margin |  |  | 1,689 |  | 576 | (48)
Other segment expenses | [2] |  | (523) | [1] | (2,724) | (3,301)
Administrative expenses |  |  |  |  |  |
Corporate expenses |  |  |  |  |  |
Other foreign exchange gain/loss |  |  |  |  |  |
EBITDA |  |  | 1,166 |  | (2,148) | (3,349)
Brand transition, restructure and transaction expenses |  |  |  | [3] |  |
Finance expense |  |  |  |  |  |
Interest income |  |  |  |  |  |
Impairment expense |  |  |  |  |  |
Depreciation and amortisation |  |  |  |  |  |
Fair value gain/(loss) on foreign exchange contracts |  |  |  |  |  |
Unrealised foreign exchange gain/(loss) |  |  |  |  |  |
Fair value (gain)/loss on Convertible Note derivative |  |  |  |  |  |
(Income/(loss) before income tax expense |  |  | 1,166 |  | (2,148) | (3,349)
Income tax benefit |  |  |  |  |  |
Loss for the period |  |  | 1,166 |  | (2,148) | (3,349)
Operating Segments [Member] | Europe Wholesale [Member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Revenue from external customers |  |  | 1,051 |  | 4,996 | 14,192
Service income |  |  |  |  |  |
Revenue |  |  | 1,051 |  | 4,996 | 14,192
Cost of sales |  |  | (785) |  | (4,490) | (10,221)
Gross margin |  |  | 266 |  | 506 | 3,971
Other segment expenses | [2] |  | 33 | [1] | (1,536) | (2,904)
Administrative expenses |  |  |  |  |  |
Corporate expenses |  |  |  |  |  |
Other foreign exchange gain/loss |  |  |  |  |  |
EBITDA |  |  | 299 |  | (1,030) | 1,067
Brand transition, restructure and transaction expenses |  |  |  | [3] |  |
Finance expense |  |  |  |  |  |
Interest income |  |  |  |  |  |
Impairment expense |  |  |  |  |  |
Depreciation and amortisation |  |  |  |  |  |
Fair value gain/(loss) on foreign exchange contracts |  |  |  |  |  |
Unrealised foreign exchange gain/(loss) |  |  |  |  |  |
Fair value (gain)/loss on Convertible Note derivative |  |  |  |  |  |
(Income/(loss) before income tax expense |  |  | 299 |  | (1,030) | 1,067
Income tax benefit |  |  |  |  |  |
Loss for the period |  |  | 299 |  | (1,030) | 1,067
Operating Segments [Member] | E-Commerce [Member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Revenue from external customers |  |  | 31,935 |  | 32,133 | 32,234
Service income |  |  |  |  |  |
Revenue |  |  | 31,935 |  | 32,133 | 32,234
Cost of sales |  |  | (20,916) |  | (21,248) | (20,974)
Gross margin |  |  | 11,020 |  | 10,885 | 11,260
Other segment expenses | [2] |  | (13,659) | [1] | (11,247) | (11,520)
Administrative expenses |  |  |  |  |  |
Corporate expenses |  |  |  |  |  |
Other foreign exchange gain/loss |  |  |  |  |  |
EBITDA |  |  | (2,639) |  | (362) | (260)
Brand transition, restructure and transaction expenses |  |  |  | [3] |  |
Finance expense |  |  |  |  |  |
Interest income |  |  |  |  |  |
Impairment expense |  |  |  |  |  |
Depreciation and amortisation |  |  |  |  |  |
Fair value gain/(loss) on foreign exchange contracts |  |  |  |  |  |
Unrealised foreign exchange gain/(loss) |  |  |  |  |  |
Fair value (gain)/loss on Convertible Note derivative |  |  |  |  |  |
(Income/(loss) before income tax expense |  |  | (2,639) |  | (362) | (260)
Income tax benefit |  |  |  |  |  |
Loss for the period |  |  | (2,639) |  | (362) | (260)
Operating Segments [Member] | Unallocated [Member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Revenue from external customers |  |  |  |  |  |
Service income |  |  |  |  |  | 102
Revenue |  |  |  |  |  | 102
Cost of sales |  |  | (4,407) |  | (4,034) | (3,123)
Gross margin |  |  | (4,407) |  | (4,034) | (3,021)
Other segment expenses | [2] |  |  | [1] |  |
Administrative expenses |  |  | (1,234) |  | (1,050) | (1,101)
Corporate expenses |  |  | (12,772) |  | (17,947) | (19,150)
Other foreign exchange gain/loss |  |  | (424) |  | 1,409 | (377)
EBITDA |  |  | (18,837) |  | (21,622) | (23,649)
Brand transition, restructure and transaction expenses |  |  | (13,687) | [3] | (10,075) | (3,272)
Finance expense |  |  | (5,213) |  | (4,041) | (8,791)
Interest income |  |  | 12 |  |  |
Impairment expense |  |  | (8,904) |  | (8,173) | (1,914)
Depreciation and amortisation |  |  | (10,603) |  | (2,382) | (3,030)
Fair value gain/(loss) on foreign exchange contracts |  |  | 729 |  | (1,704) | (502)
Unrealised foreign exchange gain/(loss) |  |  | 310 |  | 2,258 | 1,636
Fair value (gain)/loss on Convertible Note derivative |  |  |  |  | (775) | 2,393
(Income/(loss) before income tax expense |  |  | (56,193) |  | (46,514) | (37,129)
Income tax benefit |  |  | (782) |  | 1,274 | (60)
Loss for the period |  |  | $ (56,975) |  | $ (45,240) | $ (37,189)
[1] | Includes $639k opening adjustment loss at the date of adoption.
[2] | Other segment expenses relate to brand management expenses and some corporate expenses.
[3] | Brand transition, restructure and transaction expenses are shown net of proceeds from the sale of Naked brand and trademarks.

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- Definition The amount of earnings before interest, tax, depreciation and amortisation during the period. + References No definition available. + Details
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