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Share-Based Compensation - Balance and Aggregate Intrinsic Value of Stock Units (Detail) $ in Millions	3 Months Ended
	Sep. 30, 2016 USD ($) shares
Deferred stock units outstanding [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock Unit Awards Outstanding, Balance at June 30, 2016	1,005,981
Stock Unit Awards, Granted	15,025
Stock Unit Awards, Delivered	(93,681)
Stock Unit Awards, Forfeited	(56,810)
Stock Unit Awards Outstanding, Balance at September 30, 2016	870,515
Aggregate Intrinsic Value, Balance at September 30, 2016 | $	$ 49.3
Market stock units outstanding [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock Unit Awards Outstanding, Balance at June 30, 2016	146,150
Stock Unit Awards, Forfeited	(8,943)
Stock Unit Awards Outstanding, Balance at September 30, 2016	137,207
Aggregate Intrinsic Value, Balance at September 30, 2016 | $	$ 7.8

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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X

- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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X

- Definition

Intrinsic value of equity-based compensation awards outstanding. Excludes stock and unit options.

+ References

No definition available.

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