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v3.7.0.1

ACCRUED WARRANTY - Narrative (Details) | 12 Months Ended
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Mar. 31, 2017
Minimum |
Product Warranty Term [Line Items] |
Product warranty term (in years) | 1 year
Maximum |
Product Warranty Term [Line Items] |
Product warranty term (in years) | 3 years

X
- Definition Describes the approximate term of the product warranty + References No definition available. + Details
Name: | qtm_ProductWarrantyTerm
Namespace Prefix: | qtm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition [Line Items] for Duration for which we warrant our products (in years) + References No definition available. + Details
Name: | qtm_ProductWarrantyTermLineItems
Namespace Prefix: | qtm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |