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NET INCOME (LOSS) PER SHARE (Computation of Net Income (Loss) Per Share) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Earnings Per Share [Abstract]        
Net income (loss) $ 6,931us-gaap_NetIncomeLoss $ (2,458)us-gaap_NetIncomeLoss $ 3,855us-gaap_NetIncomeLoss $ (7,070)us-gaap_NetIncomeLoss
Adjustment for interest expense on convertible subordinated notes, net of taxes 902us-gaap_InterestOnConvertibleDebtNetOfTax 0us-gaap_InterestOnConvertibleDebtNetOfTax 0us-gaap_InterestOnConvertibleDebtNetOfTax 0us-gaap_InterestOnConvertibleDebtNetOfTax
Income (loss) for purposes of computing income (loss) per diluted share $ 7,833us-gaap_NetIncomeLossAttributableToParentDiluted $ (2,458)us-gaap_NetIncomeLossAttributableToParentDiluted $ 3,855us-gaap_NetIncomeLossAttributableToParentDiluted $ (7,070)us-gaap_NetIncomeLossAttributableToParentDiluted
Weighted average shares:        
Basic 255,860us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 248,135us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 253,773us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 246,183us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive shares from stock plans 4,493qtm_DilutiveCommonShareEquivalentsFromStockPlans 0qtm_DilutiveCommonShareEquivalentsFromStockPlans 4,034qtm_DilutiveCommonShareEquivalentsFromStockPlans 0qtm_DilutiveCommonShareEquivalentsFromStockPlans
Dilutive shares from convertible subordinated notes 42,502qtm_DilutiveCommonShareEquivalentsFromEspp 0qtm_DilutiveCommonShareEquivalentsFromEspp 0qtm_DilutiveCommonShareEquivalentsFromEspp 0qtm_DilutiveCommonShareEquivalentsFromEspp
Diluted 302,855us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 248,135us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 257,807us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 246,183us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic net income (loss) per share $ 0.03us-gaap_EarningsPerShareBasic $ (0.01)us-gaap_EarningsPerShareBasic $ 0.02us-gaap_EarningsPerShareBasic $ (0.03)us-gaap_EarningsPerShareBasic
Diluted net income (loss) per share $ 0.03us-gaap_EarningsPerShareDiluted $ (0.01)us-gaap_EarningsPerShareDiluted $ 0.01us-gaap_EarningsPerShareDiluted $ (0.03)us-gaap_EarningsPerShareDiluted