Debt and Credit Facilities (Additional Information) (Detail) (USD $)	3 Months Ended
Dec. 31, 2013	Sep. 30, 2013
Debt Instrument [Line Items]
Convertible debenture, face value	$ 2,471,000,000	$ 2,472,200,000
Credit facility, outstanding	479,875,000	481,016,000
Amended Credit Agreement
Debt Instrument [Line Items]
Percentage of Capital Stock of Domestic Subsidiaries Pledged as Collateral	100.00%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument, unamortized discount	(1,100,000)	(1,200,000)
Line of Credit Facility, Maximum Borrowing Capacity	75,000,000
Letters of credit, outstanding	7,200,000
Credit facility, commitment fee percentage for unused capacity	0.375%
Revolving Credit Facility [Member] \| Minimum
Debt Instrument [Line Items]
Credit facility, commitment fee percentage for unused capacity	0.375%
Revolving Credit Facility [Member] \| Maximum
Debt Instrument [Line Items]
Credit facility, commitment fee percentage for unused capacity	0.50%
Term Loan
Debt Instrument [Line Items]
Debt Covenants, Percentage of Net Cash Proceeds from Asset Sales	100.00%
Debt Covenants, Percentage of Net Cash Proceeds from Issuance or Incurrence of Debt	100.00%
Debt Covenants, Percentage of Extraordinary Receipts	100.00%
Convertible Debentures Two Point Seven Five Percent Due November One Twenty Thirty One [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate	2.75%	2.75%
Debt instrument, unamortized discount	107,500,000	113,500,000
Debt Instrument, Interest Rate, Effective Percentage	7.43%	7.43%
Debt Instrument Maturity Year	2031
2.75% Convertible Debentures due August 15, 2027
Debt Instrument [Line Items]
Debt instrument, stated interest rate	2.75%	2.75%
Debt instrument, unamortized discount	6,300,000	8,800,000
Debt Instrument, Interest Rate, Effective Percentage	7.30%	7.30%
Debt Instrument Maturity Year	2027
5.375% Senior Notes due August 15, 2020
Debt Instrument [Line Items]
Senior notes, principal amount	1,055,190,000	1,055,385,000
Debt instrument, stated interest rate	5.375%	5.375%
Debt Instrument, Interest Rate, Effective Percentage	5.283%	5.28%
Debt Instrument Maturity Year	2020
Unamortized Premium	$ (5,200,000)	$ (5,400,000)
Term loans maturing March 2013 \| LIBOR Margin
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	2.92%
Voting Equity Interests [Member] \| Amended Credit Agreement
Debt Instrument [Line Items]
Percentage of Capital Stock of Foreign Subsidiaries Pledged as Collateral	65.00%
Non-voting Equity Interests [Member] \| Amended Credit Agreement
Debt Instrument [Line Items]
Percentage of Capital Stock of Foreign Subsidiaries Pledged as Collateral	100.00%

Debt Covenants, Percentage of Extraordinary Receipts

No definition available.

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- Definition

Debt Covenants, Percentage of Net Cash Proceeds from Asset Sales

+ References

No definition available.

+ Details

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- Definition

Debt Covenants, Percentage of Net Cash Proceeds from Issuance or Incurrence of Debt

+ References

No definition available.

+ Details

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- Definition

Debt Instrument Maturity Year

+ References

No definition available.

+ Details

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- Definition

Percentage of Capital Stock of Domestic Subsidiaries Pledged as Collateral

+ References

No definition available.

+ Details

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- Definition

Percentage of Capital Stock of Foreign Subsidiaries Pledged as Collateral

+ References

No definition available.

+ Details

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400

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Period Type:	instant

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Details

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- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 1A

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	instant

- Definition

The amount of debt premium that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant

- Definition

Amount borrowed under the credit facility as of the balance sheet date.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

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- Definition

Carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Senior note holders are paid off in full before any payments are made to junior note holders.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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