Subsequent Events (Narrative) (Details)	6 Months Ended
	Sep. 30, 2018
Subsequent Events Narrative
Subsequent Event, Description	<p style="font: 10pt Times New Roman, Times, Serif; margin-right: 0; margin-left: 0">On October 26, 2018, the Company entered into an Asset Purchase Agreement with Atlassian Corporation Plc. (Atlassian) through which the Company purchased certain assets from Atlassian relating to the Jitsi open source video communications technology (Jitsi). The Company intends to integrate Jitsi's video collaboration capabilities into 8x8's technology platform to further enhance the Company's video and X Series platform offerings.</p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0"> </p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0"> </p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0"> </p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0"> </p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0"></p>