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COMMITMENTS AND CONTINGENCIES - Narrative (Details) ft² in Thousands |  | 12 Months Ended
--- | --- | ---
Jan. 23, 2018 USD ($) ft² | Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($)
Lessee, Lease, Description [Line Items] |  |  |  |
Rent expense |  | $ 10,600,000 | $ 5,600,000 | $ 5,100,000
Property and equipment under capital lease |  | 3,400,000 | 3,500,000 |
Accumulated depreciation related to assets under capital lease |  | 2,800,000 | 1,800,000 |
Headquarters Facility, San Jose, California |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Operating lease, term of contract | 132 months |  |  |
Lease, area | ft² | 162 |  |  |
Line of Credit | Standby Letters of Credit |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 8,100,000.0 |  |  |
Third-Party Customer Support Commitments |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Other commitment |  | 1,100,000 |  |
Third-Party Network Service Provider Commitments |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Other commitment |  | 1,900,000 |  |
State and Local Taxes and Surcharges |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Accrued contingent indirect tax liabilities |  | 8,000,000 | $ 800,000 |
Sales Tax |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Incremental sales tax liability |  | $ 7,200,000 |  |

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- Definition Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84164758&loc=d3e45014-112735 + Details
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- Definition The total charge for the use of long-lived depreciable assets subject to a lease meeting the criteria for capitalization. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 2) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84164758&loc=d3e45014-112735 + Details
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- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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