Quantum Corporation Annual report pursuant to Section 13 and 15(d)

GEOGRAPHIC INFORMATION - Schedule of Revenue and Long-Lived Assets by Region (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Long- Lived Assets	$ 12,939				$ 14,653				$ 12,939	$ 14,653	$ 17,574
Revenue	120,029	$ 128,048	$ 117,025	$ 110,856	147,798	$ 142,063	$ 135,106	$ 128,128	475,958	553,095	553,165
Americas
Revenues from External Customers and Long-Lived Assets [Line Items]
Long- Lived Assets	12,657				14,063				12,657	14,063	16,759
Revenue									304,007	340,811	359,259
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Long- Lived Assets	145				421				145	421	524
Revenue									124,821	152,186	143,508
Asia Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Long- Lived Assets	$ 137				$ 169				137	169	291
Revenue									$ 47,130	$ 60,098	$ 50,398