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BALANCE SHEET DETAILS - Schedule of Manufacturing Inventories (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Mar. 31, 2016
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Balance Sheet Related Disclosures [Abstract] |  |
Finished goods | $ 15,070 | $ 22,127
Work in process | 606 | 665
Materials and purchased parts | 11,985 | 17,822
Manufacturing inventories, net | $ 27,661 | $ 40,614

X
- Definition Carrying amount of completed manufactured merchandise or goods expected to be sold within one year or operating cycle, if longer. + References No definition available. + Details
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X
- Definition Carrying amount of unprocessed materials to be used in manufacturing and purchased parts that will be consumed. + References No definition available. + Details
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Namespace Prefix: | qtm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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X
- Definition Carrying amount as of the balance sheet date of raw materials, finished goods and work in progress held by the company for manufacturing. + References No definition available. + Details
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Namespace Prefix: | qtm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Carrying amount of manufactured merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer. + References No definition available. + Details
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Namespace Prefix: | qtm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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