SHARE-BASED COMPENSATION - Exercise Price Range (Details)	12 Months Ended
Mar. 31, 2017 $ / shares shares
2010 Equity Incentive Plan
Share-based compensation range of exercise prices
Exercise Prices, lower limit (in dollars per share)	$ 3.39
Exercise Prices, upper limit (in dollars per share)	$ 13.98
Number of Shares Outstanding, Options Outstanding (shares) \| shares	142,327
Weighted Average Remaining Contractual Life, Options Outstanding	11 months 27 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 8.97
Number of Shares Exercisable, Options Exercisable (shares) \| shares	138,950
Weighted average remaining contractual life for options exercisable	10 months 28 days
Weighted average exercise price, options exercisable (usd per share)	$ 8.93
Options vested and expected to vest, Number of Shares Outstanding (shares) \| shares	142,014
Options vested and expected to vest, Weighted Average Remaining Contractual Life	11 months 23 days
Options vested and expected to vest, Weighted Average Exercise Price (in dollars per share)	$ 8.97
2010 Equity Incentive Plan \| $3.39 - $5.75
Share-based compensation range of exercise prices
Exercise Prices, lower limit (in dollars per share)	3.39
Exercise Prices, upper limit (in dollars per share)	$ 5.75
Number of Shares Outstanding, Options Outstanding (shares) \| shares	15,759
Weighted Average Remaining Contractual Life, Options Outstanding	5 months 1 day
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 5.03
Number of Shares Exercisable, Options Exercisable (shares) \| shares	15,759
Weighted average remaining contractual life for options exercisable	5 months 1 day
Weighted average exercise price, options exercisable (usd per share)	$ 5.03
2010 Equity Incentive Plan \| $5.87 - $7.07
Share-based compensation range of exercise prices
Exercise Prices, lower limit (in dollars per share)	5.87
Exercise Prices, upper limit (in dollars per share)	$ 7.07
Number of Shares Outstanding, Options Outstanding (shares) \| shares	11,003
Weighted Average Remaining Contractual Life, Options Outstanding	1 year 5 months 5 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 6.63
Number of Shares Exercisable, Options Exercisable (shares) \| shares	11,003
Weighted average remaining contractual life for options exercisable	1 year 5 months 5 days
Weighted average exercise price, options exercisable (usd per share)	$ 6.63
2010 Equity Incentive Plan \| $7.08 - $10.59
Share-based compensation range of exercise prices
Exercise Prices, lower limit (in dollars per share)	7.08
Exercise Prices, upper limit (in dollars per share)	$ 10.59
Number of Shares Outstanding, Options Outstanding (shares) \| shares	62,564
Weighted Average Remaining Contractual Life, Options Outstanding	11 months 19 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 8.16
Number of Shares Exercisable, Options Exercisable (shares) \| shares	62,564
Weighted average remaining contractual life for options exercisable	11 months 19 days
Weighted average exercise price, options exercisable (usd per share)	$ 8.16
2010 Equity Incentive Plan \| $10.67 - $11.41
Share-based compensation range of exercise prices
Exercise Prices, lower limit (in dollars per share)	10.67
Exercise Prices, upper limit (in dollars per share)	$ 11.41
Number of Shares Outstanding, Options Outstanding (shares) \| shares	45,501
Weighted Average Remaining Contractual Life, Options Outstanding	1 year 1 month 21 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 11.16
Number of Shares Exercisable, Options Exercisable (shares) \| shares	42,124
Weighted average remaining contractual life for options exercisable	10 months 28 days
Weighted average exercise price, options exercisable (usd per share)	$ 11.16
2010 Equity Incentive Plan \| $11.53 - $13.98
Share-based compensation range of exercise prices
Exercise Prices, lower limit (in dollars per share)	11.53
Exercise Prices, upper limit (in dollars per share)	$ 13.98
Number of Shares Outstanding, Options Outstanding (shares) \| shares	7,500
Weighted Average Remaining Contractual Life, Options Outstanding	7 months 10 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 12.47
Number of Shares Exercisable, Options Exercisable (shares) \| shares	7,500
Weighted average remaining contractual life for options exercisable	7 months 10 days
Weighted average exercise price, options exercisable (usd per share)	$ 12.47
2014 NEXTracker Equity Incentive Plan
Share-based compensation range of exercise prices
Exercise Prices, lower limit (in dollars per share)	0.08
Exercise Prices, upper limit (in dollars per share)	$ 10.65
Number of Shares Outstanding, Options Outstanding (shares) \| shares	1,636,016
Weighted Average Remaining Contractual Life, Options Outstanding	8 years 6 months
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 3.61
Number of Shares Exercisable, Options Exercisable (shares) \| shares	369,015
Weighted average remaining contractual life for options exercisable	8 years 6 months
Weighted average exercise price, options exercisable (usd per share)	$ 5.00
Options vested and expected to vest, Number of Shares Outstanding (shares) \| shares	1,636,016
Options vested and expected to vest, Weighted Average Remaining Contractual Life	8 years 6 months
Options vested and expected to vest, Weighted Average Exercise Price (in dollars per share)	$ 3.61
2014 NEXTracker Equity Incentive Plan \| $.08 - $5.24
Share-based compensation range of exercise prices
Exercise Prices, lower limit (in dollars per share)	0.08
Exercise Prices, upper limit (in dollars per share)	$ 5.24
Number of Shares Outstanding, Options Outstanding (shares) \| shares	1,223,059
Weighted Average Remaining Contractual Life, Options Outstanding	8 years 6 months
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 1.30
Number of Shares Exercisable, Options Exercisable (shares) \| shares	229,584
Weighted average remaining contractual life for options exercisable	8 years 6 months
Weighted average exercise price, options exercisable (usd per share)	$ 1.70
2014 NEXTracker Equity Incentive Plan \| $5.25 - $10.65
Share-based compensation range of exercise prices
Exercise Prices, lower limit (in dollars per share)	5.25
Exercise Prices, upper limit (in dollars per share)	$ 10.65
Number of Shares Outstanding, Options Outstanding (shares) \| shares	412,957
Weighted Average Remaining Contractual Life, Options Outstanding	8 years 6 months
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 10.65
Number of Shares Exercisable, Options Exercisable (shares) \| shares	139,431
Weighted average remaining contractual life for options exercisable	8 years 6 months
Weighted average exercise price, options exercisable (usd per share)	$ 10.65

As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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

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- Definition

The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ References

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

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- Definition

The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ References

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

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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

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- Definition

Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

+ References

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

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- Definition

The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ References

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

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Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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