BALANCE SHEET INFORMATION - Schedule of Service Parts Inventories (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Mar. 31, 2021
Inventory
Finished goods	$ 19,234	$ 18,773
Component parts	5,020	4,648
Total service inventories	$ 24,254	$ 23,421

Carrying amount of completed service parts merchandise or goods expected to be sold within one year or operating cycle, if longer.

No definition available.

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