Performance measurement period.

No definition available.

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding at the end of the period.

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

Minimum percentage of the number of companies in the NASDAQ Composite Index that the company's stock must outperform in order for certain grants of restricted stock to vest, measured annually on a recurring basis.

+ References

No definition available.

+ Details

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- Definition

Minimum percentage of the number of companies Total Shareholder Return in the NASDAQ Industrial Index that the company's stock must outperform in order for certain grants of restricted stock to vest, measured annually on a recurring basis.

+ References

No definition available.

+ Details

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- Definition

Percentage of performance based restricted stock units tied to incentive program.

+ References

No definition available.

+ Details

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- Definition

Vesting requirement measurement period in years.

+ References

No definition available.

+ Details

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- Definition

Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

+ References

No definition available.

+ Details

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- Definition

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.

+ References

No definition available.

+ Details

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

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

+ 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)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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- Definition

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).

+ 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)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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- Definition

Per share weighted average intrinsic value of equity-based compensation awards granted. Excludes stock and unit options.

+ 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)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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- Definition

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.

+ 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)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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- Definition

Weighted average remaining contractual term for equity-based awards excluding options, 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
-Subparagraph (e)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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- Definition

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

+ 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)(2)(iii)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ 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 (d)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Percentage of vesting of share-based compensation awards.

+ References

+ Details

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- Definition

Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30
-Article 5

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STOCK-BASED COMPENSATION - NARRATIVE (Details) - USD ($) $ / shares in Units, $ in Thousands				1 Months Ended	12 Months Ended
	May 20, 2016	May 20, 2015	Apr. 01, 2014	Apr. 30, 2011	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Management Agreement
Nonvested shares (in shares)					0	1,133,000
Vested (in shares)					591,912
Forfeited (in shares)					27,578
Zelnick Media Corporation \| 2014 Management Agreement
Management Agreement
Granted (in shares)	372,935	525,591			372,935	525,591
Restricted stock
Management Agreement
Award vesting period					3 years
Granted (in shares)					1,161,000
Nonvested shares (in shares)					4,259,000	6,405,000
Vested (in shares)					3,220,000
Forfeited (in shares)					87,000
Target vesting					100.00%
Future unrecognized compensation cost, net of estimated forfeitures					$ 95,965
Weighted average remaining contractual terms					1 year
Time Based
Management Agreement
Intrinsic value (in dollars per share)					$ 49.43	$ 33.74	$ 21.52
Time Based \| Zelnick Media Corporation
Management Agreement
Intrinsic value (in dollars per share)					36.37	27.65	21.92
Market-based restricted shares \| Zelnick Media Corporation
Management Agreement
Restricted stock marter performance measure - industrial index			50.00%
Options granted in period (in dollars per shares)					51.92	58.45	24.21
Employee Market-Based
Management Agreement
Options granted in period (in dollars per shares)					$ 63.60	$ 43.66	$ 36.56
New Management Agreement \| Restricted stock \| Zelnick Media Corporation
Management Agreement
Granted (in shares)				1,100,000
New Management Agreement \| Market-based restricted shares \| Zelnick Media Corporation
Management Agreement
Granted (in shares)				1,650,000
2014 Management agreement \| Zelnick Media Corporation
Management Agreement
Units tied to incentive program			50.00%
2014 Management agreement \| Restricted stock
Management Agreement
Non-vested restricted stock units (in shares)					898,526	1,145,081
2014 Management agreement \| Market-based restricted shares \| Zelnick Media Corporation
Management Agreement
Restricted stock market performance measure - composite index			75.00%
Vesting requirement measurement period			2 years
New IP incentive program \| 2014 Management agreement \| Zelnick Media Corporation
Management Agreement
Units tied to incentive program			50.00%
Major IP incentive program \| 2014 Management agreement \| Zelnick Media Corporation
Management Agreement
Units tied to incentive program			50.00%
New IP and Major IP incentive programs \| 2014 Management agreement \| Zelnick Media Corporation
Management Agreement
Performance measurement period			2 years
Performance and market-based restricted stock awards
Management Agreement
Number of shares granted eligible to vest maximum					228,587
Number of shares outstanding eligible to vest maximum					886,360
Liability awards
Management Agreement
Future unrecognized compensation cost, net of estimated forfeitures					$ 165,596
Weighted average remaining contractual terms					3 years 10 months 24 days
Shares issued under stock based awards					5,500,000