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Product Line Divestiture (Details) - Clearfield, Inc. - Outdoor Cabinet Product Line - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Feb. 28, 2018	Mar. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal group, consideration	$ 10.4
Inventory transferred	$ 2.1
Period of new orders solicitation	15 months
Disposal group, deferred revenue	$ 1.6
Gain on disposal		$ 6.7

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Amount classified as deferred revenue attributable to disposal group held for sale or disposed of.

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