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Share-Based Compensation - Market Stock Units - Additional Information (Detail) - Market stock units outstanding [Member] $ / shares in Units, $ in Millions | 12 Months Ended
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Jun. 30, 2018 USD ($) $ / shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Vesting period of the underlying awards | 3 years
Potential payout range | 100.00%
Potential payout adjustment ratio | 2.00%
Closing price of common stock used to calculate Aggregate intrinsic value of stock option outstanding | $ / shares | $ 50.37
Unrecognized share-based compensation cost | $ | $ 14.4
Unrecognized share-based compensation, period for recognition | 1 year 1 month 13 days
October 2014 MSU Grants [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
SOX Index TSR percentage points | 118.00%
Percentage of targeted shares, MSU grants | 0.00%
October 2015 MS Grants [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
SOX Index TSR percentage points | 115.00%
Percentage of targeted shares, MSU grants | 0.00%
October 2016 MSU Grants [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
SOX Index TSR percentage points | 60.00%
Percentage of targeted shares, MSU grants | 0.00%
Minimum [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Potential payout range | 0.00%
Maximum [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Potential payout range | 200.00%
Share-based Compensation Award, First Tranche [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Vesting period of the underlying awards | 1 year
Share-based Compensation Award, First Tranche [Member] | Maximum [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Potential payout range | 100.00%
Share-based Compensation Award, Second Tranche [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Vesting period of the underlying awards | 2 years
Share-based Compensation Award, Second Tranche [Member] | Maximum [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Potential payout range | 100.00%
Share-based Compensation Award, Third Tranche [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Vesting period of the underlying awards | 3 years

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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 (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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