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Note 10 - Share-based Compensation and Other Benefit Plans (Details Textual) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance | 3,656,000 | 3,452,000 | 2,821,000 | 1,819,000
Share-based Payment Arrangement, Accelerated Cost |  | $ 8.3 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ 34.66 | $ 22.07 | $ 18.21 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value | $ 159.0 | $ 10.6 | $ 2.3 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value | 31.7 | 8.8 | 5.0 |
Share-based Payment Arrangement, Expense, Tax Benefit |  | 0.4 | 0.5 |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ 26.6 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-vested, Forfeiture Rate | 3.00% |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition | 2 years |  |  |
US Profit Sharing and Savings Plan [Member] |  |  |  |
Defined Contribution Plan, Cost | $ 2.8 | 2.5 | 2.2 |
GB Profit Sharing and Savings Plan [Member] |  |  |  |
Defined Contribution Plan, Cost | 1.4 | 1.4 | 0.8 |
Selling, General and Administrative Expenses [Member] |  |  |  |
Share-based Payment Arrangement, Expense | 32.3 | 28.2 | 14.6 |
Restricted Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value | 2.3 | 1.7 | 1.4 |
Restricted Stock Units (RSUs) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value | $ 3.1 | $ 1.6 | 0.9 |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  | 3 years |  |
Equity Incentive Plan 2010 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | 7,500,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 2,600,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance | 3,600,000 |  |  |
Equity Incentive Plan 2010 [Member] | Maximum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period | 10 years |  |  |
Nonqualified Stock Options Plan 1998 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance | 20,000 |  |  |
Employee Stock Purchase Plan 2014 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | 200,000 |  |  |
Share-based Payment Arrangement, Expense | $ 0.5 | $ 0.3 | 0.2 |
Performance Incentive Programs [Member] | Executive Officer [Member] |  |  |  |
Salary and Wage, Officer, Excluding Cost of Good and Service Sold | $ 9.3 | $ 7.2 | $ 4.7 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total | 618,898 | 553,750 | 896,778 |
Performance Incentive Programs [Member] | Restricted Stock [Member] | Executive Officer [Member] |  |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Gross | 11,279 | 14,194 | 16,653 |
Performance Incentive Programs [Member] | Restricted Stock Units (RSUs) [Member] | Executive Officer [Member] |  |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Gross | 25,903 | 35,174 |  | 39,931

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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + 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 (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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