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Summary of Significant Accounting Policies - Goodwill and Intangible Assets (Details) $ in Thousands				1 Months Ended	3 Months Ended	12 Months Ended
	Jan. 27, 2020 USD ($)	Oct. 02, 2017 USD ($)	Jul. 31, 2014 USD ($)	Jan. 31, 2018 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2020 USD ($) item	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2020 USD ($)	Jan. 27, 2020 USD ($)	Jun. 30, 2019 USD ($)
Intangible Assets:
Amortization expense						$ 6,100	$ 3,000	$ 3,000
Goodwill					$ 174,939	90,197	90,200	90,200	$ 174,939		$ 90,197
Impairment of goodwill						$ 0
Number of reporting units | item						1
Future amortization of intangible assets
Fiscal 2021									8,000
Fiscal 2022									7,900
Fiscal 2023									7,700
Fiscal 2024									6,700
Fiscal 2025									5,500
Thereafter									41,400
Rollforward of Goodwill
Balance at the beginning of the period						$ 90,197	90,200	87,200
Acquisition						84,741		2,983
Balance at the end of the period					174,939	174,939	$ 90,197	90,200
Intangible Assets
Gross Carrying Amount									111,200		42,700
Accumulated Amortization									(33,700)		(27,700)
Net Carrying Value									77,500		15,000
Trade names
Intangible Assets
Gross Carrying Amount									77,900		17,600
Accumulated Amortization									(12,000)		(9,400)
Net Carrying Value									65,900		8,200
Customer and distributor relationships
Intangible Assets
Gross Carrying Amount									25,300		20,500
Accumulated Amortization									(17,200)		(14,700)
Net Carrying Value									8,100		5,800
Developed technology
Intangible Assets
Gross Carrying Amount									6,600		3,200
Accumulated Amortization									(3,500)		(2,800)
Net Carrying Value									3,100		400
Other
Intangible Assets
Gross Carrying Amount									1,400		1,400
Accumulated Amortization									(1,000)		(800)
Net Carrying Value									400		$ 600
LearnBop
Intangible Assets:
Ownership percentage acquired (as a percent)			51.00%	49.00%
Cash purchase price			$ 6,500	$ 500
Galvanize Inc
Intangible Assets:
Amortization expense					400
Goodwill	$ 84,741				84,700	84,700			$ 84,700	$ 84,741
Ownership percentage acquired (as a percent)										100.00%
Cash and contingent consideration paid	165,000
Rollforward of Goodwill
Balance at the beginning of the period					107,600
Acquisition						84,700
Balance at the end of the period	$ 84,741				$ 84,700	$ 84,700
Big Universe Inc.
Intangible Assets:
Ownership percentage acquired (as a percent)		100.00%
Cash and contingent consideration paid		$ 3,300
Rollforward of Goodwill
Acquisition								$ 3,000

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