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Employee Compensation Plans - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Sep. 30, 2013
Final Payments Under Existing Cash Bonus Program
Employee Compensation Plans
Payments to employees	$ 10.9
Management Annual Incentive Plan | Minimum
Employee Compensation Plans
Incentive plan payout percentages of target values	0.00%
Management Annual Incentive Plan | Maximum
Employee Compensation Plans
Incentive plan payout percentages of target values	200.00%
Annual Incentive Plan
Employee Compensation Plans
Accrued bonuses	19.9
Performance Units
Employee Compensation Plans
Incentive plan, number of performance units granted in period	31,100
Incentive plan payout, performance below minimum target threshold	0
Performance units liability	$ 0.8
Performance Units | Minimum
Employee Compensation Plans
Incentive plan payout percentages of target values	50.00%
Performance Units | Maximum
Employee Compensation Plans
Incentive plan payout percentages of target values	200.00%

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- Definition

Incentive plan payout percentages of target values based on performance above a minimum threshold

+ References

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Incentive plan payout if actual performance is below established minimum target thresholds

+ References

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- Definition

Amount of liabilities accrued for share-based compensation as of the reporting date.

+ References

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- Definition

Carrying value as of the balance sheet date of obligations incurred and payable for incentive compensation awarded to employees and directors or earned by them based on the terms of one or more relevant arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.15(5))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.15(a))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 15

-Subparagraph a

-Article 7



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 15

-Subparagraph 5

-Article 9

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Payments of cash to employees, including wages and salaries, during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 25

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585

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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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