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Summary of Significant Accounting Policies - Intangibles and Goodwill (Details) $ in Thousands |  |  |  |  | 1 Months Ended | 12 Months Ended | 14 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 02, 2017 USD ($) | Dec. 27, 2016 USD ($) | Apr. 21, 2016 USD ($) | Jul. 31, 2014 USD ($) | Jan. 31, 2018 USD ($) | Jun. 30, 2018 USD ($) item | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($)
Intangible Assets: |  |  |  |  |  |  |  |  |
Amortization expense |  |  |  |  |  | $ 3,000 | $ 2,900 | $ 2,700 |
Number of reporting units | item |  |  |  |  |  | 1 |  |  |
Future amortization of intangible assets |  |  |  |  |  |  |  |  |
2019 |  |  |  |  |  | $ 3,000 |  |  |
2020 |  |  |  |  |  | 2,900 |  |  |
2021 |  |  |  |  |  | 2,400 |  |  |
2022 |  |  |  |  |  | 2,200 |  |  |
2023 |  |  |  |  |  | 2,000 |  |  |
Thereafter |  |  |  |  |  | 5,200 |  |  |
Rollforward of Goodwill |  |  |  |  |  |  |  |  |
Balance at the beginning of the period |  |  |  |  |  | 87,214 | 87,300 | 66,200 |
Acquisition |  |  |  |  |  | 2,983 |  | 21,054 |
Balance at the end of the period |  |  |  |  |  | 90,197 | 87,214 | 87,300 | $ 87,214
Intangible Assets |  |  |  |  |  |  |  |  |
Gross Carrying Amount |  |  |  |  |  | 42,700 | 42,000 |  | 42,000
Accumulated Amortization |  |  |  |  |  | (24,700) | (21,800) |  | (21,800)
Net Carrying Value |  |  |  |  |  | 18,000 | 20,200 |  | 20,200
Middlebury Interactive Languages LLC |  |  |  |  |  |  |  |  |
Intangible Assets: |  |  |  |  |  |  |  |  |
Ownership percentage acquired (as a percent) |  | 40.00% |  |  |  |  |  |  |
Cash purchase price |  | $ 9,100 |  |  |  |  |  |  |
Trade names |  |  |  |  |  |  |  |  |
Intangible Assets |  |  |  |  |  |  |  |  |
Gross Carrying Amount |  |  |  |  |  | 17,600 | 17,600 |  | 17,600
Accumulated Amortization |  |  |  |  |  | (8,500) | (7,600) |  | (7,600)
Net Carrying Value |  |  |  |  |  | 9,100 | 10,000 |  | 10,000
Customer and distributor relationships |  |  |  |  |  |  |  |  |
Intangible Assets |  |  |  |  |  |  |  |  |
Gross Carrying Amount |  |  |  |  |  | 20,500 | 20,100 |  | 20,100
Accumulated Amortization |  |  |  |  |  | (13,400) | (12,000) |  | (12,000)
Net Carrying Value |  |  |  |  |  | 7,100 | 8,100 |  | 8,100
Developed technology |  |  |  |  |  |  |  |  |
Intangible Assets |  |  |  |  |  |  |  |  |
Gross Carrying Amount |  |  |  |  |  | 3,200 | 2,900 |  | 2,900
Accumulated Amortization |  |  |  |  |  | (2,200) | (1,700) |  | (1,700)
Net Carrying Value |  |  |  |  |  | 1,000 | 1,200 |  | 1,200
Other |  |  |  |  |  |  |  |  |
Intangible Assets |  |  |  |  |  |  |  |  |
Gross Carrying Amount |  |  |  |  |  | 1,400 | 1,400 |  | 1,400
Accumulated Amortization |  |  |  |  |  | (600) | (500) |  | (500)
Net Carrying Value |  |  |  |  |  | 800 | 900 |  | 900
LearnBop |  |  |  |  |  |  |  |  |
Intangible Assets: |  |  |  |  |  |  |  |  |
Ownership percentage acquired (as a percent) |  |  |  | 51.00% | 49.00% |  |  |  |
Cash purchase price |  |  |  | $ 6,500 | $ 500 |  |  |  |
LTS |  |  |  |  |  |  |  |  |
Intangible Assets: |  |  |  |  |  |  |  |  |
Ownership percentage acquired (as a percent) |  |  | 100.00% |  |  |  |  |  |
Cash purchase price |  |  | $ 20,200 |  |  |  |  |  | 20,200
Cash and contingent consideration paid |  |  | 23,100 |  |  |  |  |  | 23,100
Rollforward of Goodwill |  |  |  |  |  |  |  |  |
Balance at the beginning of the period |  |  |  |  |  | 21,000 |  |  |
Acquisition |  |  |  |  |  |  |  | $ 21,100 |
Adjustments |  |  |  |  |  |  | (100) |  |
Balance at the end of the period |  |  | $ 21,000 |  |  |  | $ 21,000 |  | $ 21,000
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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