SHARE-BASED COMPENSATION - Narrative (Details) $ / shares in Units, $ in Millions	3 Months Ended
Jul. 01, 2016 USD ($) $ / shares shares
Share options
Share-based compensation
Weighted average exercise price of exercisable shares (in dollars per share) \| $ / shares	$ 0.00
Options exercisable (shares)	0
2010 Equity Incentive Plan \| Share options
Share-based compensation
Share options outstanding (shares)	1,200,000
Options outstanding, weighted average exercise price (in dollars per share) \| $ / shares	$ 8.49
Weighted average exercise price of exercisable shares (in dollars per share) \| $ / shares	$ 8.49
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)	5,600,000
Number of shares outstanding (shares)	16,400,000
Unrecognized compensation expense \| $	$ 177.4
Share weighted-average remaining vesting period	2 years 11 months 16 days
2010 Equity Incentive Plan \| Restricted Stock Units
Share-based compensation
Unvested share bonus awards granted (shares)	4,700,000
Average grant date price of unvested share bonus awards (in dollars per share) \| $ / shares	$ 12.80
2010 Equity Incentive Plan \| Share Bonus Awards with Market Conditions
Share-based compensation
Number of shares outstanding (shares)	2,300,000
Unrecognized compensation expense \| $	$ 30.1
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 (in dollars 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
Measurement period	3 years
Vesting 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 (in dollars per share) \| $ / shares	$ 12.82
2014 NEXTracker Equity Incentive Plan
Share-based compensation
Unvested share bonus awards granted (shares)	0
Number of shares outstanding (shares)	2,300,000
Unrecognized compensation expense \| $	$ 16.5
Share weighted-average remaining vesting period	2 years 1 month 18 days
2014 NEXTracker Equity Incentive Plan \| Share options
Share-based compensation
Share options outstanding (shares)	2,400,000
Options outstanding, weighted average exercise price (in dollars per share) \| $ / shares	$ 3.79
Weighted average exercise price of exercisable shares (in dollars per share) \| $ / shares	$ 5.35
Compensation not yet recognized \| $	$ 14.0
Share weighted-average remaining vesting period	2 years 6 months 26 days
Options exercisable (shares)	300,000
BrightBox Equity Incentive Plan \| Share options
Share-based compensation
Share options outstanding (shares)	200,000
Options outstanding, weighted average exercise price (in dollars per share) \| $ / shares	$ 0.51
Compensation not yet recognized \| $	$ 1.8
Share weighted-average remaining vesting period	2 years 10 months 17 days
Options granted in period (shares)	200,000
Options granted, weighted average exercise price (in dollars per share) \| $ / shares	$ 11.99
Options exercisable (shares)	0
Vesting period	3 years

Share-based Compensation Arrangement by Share-based Payment Award, Measurement Period

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Unrecognized cost of unvested share-based compensation awards.

+ 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 (i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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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-Publisher FASB
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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Gross number of share options (or share units) granted during the period.

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No definition available.

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

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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