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Benefit Plans - ESPP Information (Details) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Equity Incentive Plans |  |  |  |
Compensation expense | $ 12,770 | $ 10,099 | $ 24,832 | $ 19,524
Employee stock purchase plan shares |  |  |  |
Equity Incentive Plans |  |  |  |
Percentage of employee compensation, maximum | 10.00% |  | 10.00% |
Percentage of fair market value as a purchase price |  |  | 85.00% |
Maximum value of purchase per employee |  |  | $ 25 |
Number of shares per employee, maximum |  |  | 2 |
Period during which shares can be purchased |  |  | 1 year |
Number of shares of common stock reserved for issuance | 950 |  | 950 |
Potential number of additional shares reserved for issuance each year |  |  | 400 |
Potential number of additional shares reserved for issuance each year (as percent) |  |  | 0.75% |
Number of shares issued |  |  | 45 |
Compensation expense | $ 715 | $ 446 | $ 1,377 | $ 885
Valuation assumptions: |  |  |  |
Expected dividend yield |  |  | 0.00% | 0.00%
Expected term (years) |  |  | 6 months | 6 months
Employee stock purchase plan shares | Minimum |  |  |  |
Valuation assumptions: |  |  |  |
Expected volatility |  |  | 38.60% | 33.50%
Risk-free interest rate |  |  | 1.58% | 2.10%
Employee stock purchase plan shares | Maximum |  |  |  |
Equity Incentive Plans |  |  |  |
Offering period |  |  | 27 months |
Valuation assumptions: |  |  |  |
Expected volatility |  |  | 43.30% | 38.30%
Risk-free interest rate |  |  | 2.44% | 2.48%

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- Definition Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.D.2) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 + Details
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