SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Share-Based Compensation (Details)	12 Months Ended
Mar. 31, 2017	Mar. 31, 2015
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pricing model used in estimating grant-date fair value	Black-Scholes
Market RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pricing model used in estimating grant-date fair value	Monte-Carlo	Monte Carlo

For each plan, identification of the award pricing model or other valuation method used in calculating the weighted average fair values disclosed. The model is also used to calculate the compensation expense that is shown within the balance sheet, income statement, and cash flow. Examples of valuation techniques are lattice models (binomial model), closed-form models (Black-Scholes-Merton formula), and a Monte Carlo simulation technique. Fair value is the amount at which an asset or liability could be bought or incurred or sold or settled in a current transaction between willing parties, that is, other than in a forced or liquidation sale. May include disclosures about the assumptions underlying application of the method selected.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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