BALANCE SHEET DETAILS - Schedule of Manufacturing Inventories (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Mar. 31, 2015
Balance Sheet Related Disclosures [Abstract]
Finished goods	$ 22,127	$ 28,022
Work in process	665	58
Materials and purchased parts	17,822	22,194
Manufacturing inventories, net	$ 40,614	$ 50,274

Carrying amount of manufactured merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

No definition available.

Name:	qtm_ManufacturingInventoriesWorkInProcess
Namespace Prefix:	qtm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant