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Business Combinations - Summary of Actual Revenue and Net Loss Included in Consolidated Statements of Income (Detail) - Sumitomo Electric Lightwave Corp.'s North American EPON Business [Member] - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Sep. 30, 2018	Sep. 30, 2018
Business Acquisition [Line Items]
Revenue	$ 1,021	$ 2,218
Net income (loss)	$ 564	$ (322)

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- Definition

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- Definition

This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

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