Annual report pursuant to Section 13 and 15(d)

GEOGRAPHIC INFORMATION - Schedule of Revenues Attributable to Product Groups, Services and Royalties (Details)

v2.4.1.9
GEOGRAPHIC INFORMATION - Schedule of Revenues Attributable to Product Groups, Services and Royalties (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Product revenue                 $ 355,579us-gaap_SalesRevenueGoodsNet $ 348,318us-gaap_SalesRevenueGoodsNet $ 398,910us-gaap_SalesRevenueGoodsNet
Service revenue                 155,674us-gaap_SalesRevenueServicesNet 147,199us-gaap_SalesRevenueServicesNet 144,037us-gaap_SalesRevenueServicesNet
Royalty revenue                 41,842us-gaap_RoyaltyRevenue 57,648us-gaap_RoyaltyRevenue 44,492us-gaap_RoyaltyRevenue
Total revenue 147,798us-gaap_Revenues 142,063us-gaap_Revenues 135,106us-gaap_Revenues 128,128us-gaap_Revenues 127,968us-gaap_Revenues 145,869us-gaap_Revenues 131,479us-gaap_Revenues 147,849us-gaap_Revenues 553,095us-gaap_Revenues 553,165us-gaap_Revenues 587,439us-gaap_Revenues
Tape automation systems                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Product revenue                 152,205us-gaap_SalesRevenueGoodsNet
/ qtm_RevenueByTypeAxis
= qtm_TapeAutomationSystemsMember
174,438us-gaap_SalesRevenueGoodsNet
/ qtm_RevenueByTypeAxis
= qtm_TapeAutomationSystemsMember
206,112us-gaap_SalesRevenueGoodsNet
/ qtm_RevenueByTypeAxis
= qtm_TapeAutomationSystemsMember
Disk backup systems                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Product revenue                 54,845us-gaap_SalesRevenueGoodsNet
/ qtm_RevenueByTypeAxis
= qtm_DiskbackupsystemsMember
50,217us-gaap_SalesRevenueGoodsNet
/ qtm_RevenueByTypeAxis
= qtm_DiskbackupsystemsMember
74,255us-gaap_SalesRevenueGoodsNet
/ qtm_RevenueByTypeAxis
= qtm_DiskbackupsystemsMember
Devices and media                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Product revenue                 62,642us-gaap_SalesRevenueGoodsNet
/ qtm_RevenueByTypeAxis
= qtm_DevicesAndMediaMember
70,680us-gaap_SalesRevenueGoodsNet
/ qtm_RevenueByTypeAxis
= qtm_DevicesAndMediaMember
68,724us-gaap_SalesRevenueGoodsNet
/ qtm_RevenueByTypeAxis
= qtm_DevicesAndMediaMember
Scale-out storage solutions                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Product revenue                 $ 85,887us-gaap_SalesRevenueGoodsNet
/ qtm_RevenueByTypeAxis
= qtm_ScaleoutstoragesolutionsMember
$ 52,983us-gaap_SalesRevenueGoodsNet
/ qtm_RevenueByTypeAxis
= qtm_ScaleoutstoragesolutionsMember
$ 49,819us-gaap_SalesRevenueGoodsNet
/ qtm_RevenueByTypeAxis
= qtm_ScaleoutstoragesolutionsMember