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Fair Value Measurements - Schedule of Fair Value of Financial Assets and Liabilities (Detail) - USD ($) $ in Millions | Mar. 31, 2019 | Jun. 30, 2018
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Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |
Total fair value of financial assets and liability |  | $ 103.2 | $ 101.2
Money Market Funds [Member] |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |
Total fair value of financial assets | [1] | 12.1 | 12.5
Corporate Bonds and Notes [Member] |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |
Total fair value of financial assets |  | 67.6 | 53.3
Municipal Bonds [Member] |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |
Total fair value of financial assets |  | 18.1 | 29.2
Federal Agency Issues [Member] |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |
Total fair value of financial assets |  | 12.1 | 12.4
US Government Securities [Member] |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |
Total fair value of financial assets |  | 7.3 | 8.3
Contingent Consideration [Member] |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |
Total fair value of financial liability |  | (14.0) | (14.5)
Level 1 [Member] |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |
Total fair value of financial assets and liability |  | 12.1 | 15.3
Level 1 [Member] | Money Market Funds [Member] |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |
Total fair value of financial assets | [1] | 12.1 | 12.5
Level 1 [Member] | Corporate Bonds and Notes [Member] |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |
Total fair value of financial assets |  |  | 2.8
Level 2 [Member] |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |
Total fair value of financial assets and liability |  | 105.1 | 100.4
Level 2 [Member] | Corporate Bonds and Notes [Member] |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |
Total fair value of financial assets |  | 67.6 | 50.5
Level 2 [Member] | Municipal Bonds [Member] |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |
Total fair value of financial assets |  | 18.1 | 29.2
Level 2 [Member] | Federal Agency Issues [Member] |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |
Total fair value of financial assets |  | 12.1 | 12.4
Level 2 [Member] | US Government Securities [Member] |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |
Total fair value of financial assets |  | 7.3 | 8.3
Level 3 [Member] |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |
Total fair value of financial assets and liability |  | (14.0) | (14.5)
Level 3 [Member] | Contingent Consideration [Member] |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |
Total fair value of financial liability |  | $ (14.0) | $ (14.5)
[1] | Money market funds are primarily comprised of exchange traded funds and accrued interest

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