SHARE-BASED COMPENSATION - Additional Information (Details) $ / shares in Units, $ in Millions	9 Months Ended
Dec. 31, 2016 USD ($) $ / shares shares
Share options
Share-based compensation
Options exercisable (shares)	200,000
2010 Equity Incentive Plan \| Share options
Share-based compensation
Share options outstanding (shares)	200,000
Options outstanding, weighted average exercise price (usd per share) \| $ / shares	$ 8.97
Weighted average exercise price of exercisable shares (usd per share) \| $ / shares	$ 8.93
2010 Equity Incentive Plan \| Restricted Stock Units, Share Bonus Awards with Market Conditions, and Share Bonus Awards With Free Cash Flow Targets
Share-based compensation
Unvested share bonus awards granted (shares)	6,300,000
Number of shares outstanding (shares)	15,800,000
Unrecognized compensation expense \| $	$ 139.2
Share weighted-average remaining vesting period	2 years 7 months 6 days
2010 Equity Incentive Plan \| Restricted Stock Units
Share-based compensation
Unvested share bonus awards granted (shares)	5,400,000
Average grant date price of unvested share bonus awards (usd per share) \| $ / shares	$ 12.93
2010 Equity Incentive Plan \| Share Bonus Awards with Market Conditions
Share-based compensation
Number of shares outstanding (shares)	2,300,000
Unrecognized compensation expense \| $	$ 22.6
2010 Equity Incentive Plan \| Share Bonus Awards with Market Conditions \| Fiscal 2013
Share-based compensation
Shares vested (shares)	3,500,000
2010 Equity Incentive Plan \| Share Bonus Awards with Market Conditions \| Minimum
Share-based compensation
Number of shares that may be issued (shares)	0
2010 Equity Incentive Plan \| Share Bonus Awards with Market Conditions \| Maximum
Share-based compensation
Number of shares that may be issued (shares)	4,600,000
2010 Equity Incentive Plan \| Share Bonus Awards with Market Conditions \| Key employees
Share-based compensation
Unvested share bonus awards granted (shares)	700,000
Average grant date price of unvested share bonus awards (usd per share) \| $ / shares	$ 17.57
Vesting period	3 years
2010 Equity Incentive Plan \| Share Bonus Awards with Market Conditions \| Key employees \| Minimum
Share-based compensation
Unvested share bonus awards granted (shares)	0
2010 Equity Incentive Plan \| Share Bonus Awards with Market Conditions \| Key employees \| Maximum
Share-based compensation
Unvested share bonus awards granted (shares)	1,400,000.0
2010 Equity Incentive Plan \| Share Bonus Awards with Market Conditions \| Certain executive officers
Share-based compensation
Vesting period	3 years
Measurement period	3 years
2010 Equity Incentive Plan \| Share Bonus Awards with Market Conditions \| Certain executive officers \| Minimum
Share-based compensation
Unvested share bonus awards granted (shares)	0
2010 Equity Incentive Plan \| Share Bonus Awards with Market Conditions \| Certain executive officers \| Maximum
Share-based compensation
Unvested share bonus awards granted (shares)	400,000
2010 Equity Incentive Plan \| Share Bonus Awards With Free Cash Flow Targets \| Certain executive officers
Share-based compensation
Unvested share bonus awards granted (shares)	200,000
Nonvested average grant date price (usd per share) \| $ / shares	$ 12.82
2014 NEXTracker Equity Incentive Plan
Share-based compensation
Number of shares outstanding (shares)	1,600,000
Unrecognized compensation expense \| $	$ 10.7
Share weighted-average remaining vesting period	1 year 9 months 18 days
Options granted in period (shares)	0
2014 NEXTracker Equity Incentive Plan \| Share options
Share-based compensation
Share options outstanding (shares)	1,800,000
Options outstanding, weighted average exercise price (usd per share) \| $ / shares	$ 3.54
Weighted average exercise price of exercisable shares (usd per share) \| $ / shares	$ 4.48
Share weighted-average remaining vesting period	2 years 1 month 6 days
Options exercisable (shares)	400,000
Compensation not yet recognized \| $	$ 9.2
BrightBox Technologies 2013 Plan \| Share options
Share-based compensation
Share options outstanding (shares)	200,000
Options outstanding, weighted average exercise price (usd per share) \| $ / shares	$ 0.51
Vesting period	3 years
Share weighted-average remaining vesting period	2 years 4 months 24 days
Options granted in period (shares)	200,000
Options exercisable (shares)	0
Grants in period, weighted average grant date fair value (usd per share) \| $ / shares	$ 11.99
Compensation not yet recognized \| $	$ 1.5

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested options awarded to employees as compensation.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Number of share instruments newly issued under a share-based compensation plan.

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