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Revenue Recognition - Schedule of Changes in Contract Assets and Deferred Revenues (Details) - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2018	Mar. 31, 2018
Contractors [Abstract]
Other current assets	$ 1,782	$ 1,725
Change in other current assets	57
Deferred revenue	3,364	$ 2,578
Change in deferred revenue	$ 786

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- References

No definition available.

+ Details

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Namespace Prefix:	EGHT_
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Balance Type:	debit
Period Type:	duration

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- Definition

Amount of increase (decrease) in current contract assets, net

+ References

No definition available.

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Namespace Prefix:	EGHT_
Data Type:	xbrli:monetaryItemType
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- Definition

Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130533-203044

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- Definition

Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

+ References

No definition available.

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Balance Type:	credit
Period Type:	instant