Intangible Assets - Intangible Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Jun. 30, 2018
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 194,752	$ 172,068
Accumulated Amortization	(167,320)	(163,495)
Net Carrying Amount	27,432	8,573
Customer/publisher/advertiser relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	62,399	41,101
Accumulated Amortization	(39,479)	(37,286)
Net Carrying Amount	22,920	3,815
Content [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	60,959	60,969
Accumulated Amortization	(60,932)	(60,930)
Net Carrying Amount	27	39
Website/trade/domain names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	31,995	31,098
Accumulated Amortization	(29,987)	(29,369)
Net Carrying Amount	2,008	1,729
Acquired technology and others [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	39,399	38,900
Accumulated Amortization	(36,922)	(35,910)
Net Carrying Amount	$ 2,477	$ 2,990