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Senior Notes - Additional Information (Detail)	May. 07, 2015 USD ($)	Jul. 14, 2010 USD ($) Contract	May. 07, 2008 USD ($) Contract	Jun. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)
Debt Instrument [Line Items]
Senior Notes, weighted average interest rate				1.835%
Carrying value of Senior Notes				$ 376,000,000	$ 447,000,000
Fair value of Senior Notes				$ 403,200,000	$ 462,700,000
May 2008 senior notes
Debt Instrument [Line Items]
Senior Notes issued in a private placement to a group of institutional investors			$ 275,000,000
Number of series of Senior Notes issued | Contract			4
Senior Notes, weighted average interest rate			7.20%
Senior Notes, weighted average maturity (in years)			10 years
May 2008 senior notes | Minimum
Debt Instrument [Line Items]
Senior Notes, maturity (in years)			5 years
May 2008 senior notes | Maximum
Debt Instrument [Line Items]
Senior Notes, maturity (in years)			10 years
Series C
Debt Instrument [Line Items]
Repayment of principal balance	$ 63,000,000
July 2010 senior notes
Debt Instrument [Line Items]
Senior Notes issued in a private placement to a group of institutional investors		$ 245,000,000
Number of series of Senior Notes issued | Contract		4
Senior Notes, weighted average interest rate		5.20%
Senior Notes, weighted average maturity (in years)		8 years
July 2010 senior notes | Minimum
Debt Instrument [Line Items]
Senior Notes, maturity (in years)		6 years
July 2010 senior notes | Maximum
Debt Instrument [Line Items]
Senior Notes, maturity (in years)		10 years

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Long Term Debt, Weighted Average Maturity

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Including the current and noncurrent portions, 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). Senior note holders are paid off in full before any payments are made to junior note holders.

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