Description of the frequency of periodic payments (monthly, quarterly, annual).

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- Definition

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

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-Publisher FASB

-Name Accounting Standards Codification

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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.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Weighted average interest rate of debt outstanding.

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- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

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-Name Accounting Standards Codification

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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.

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Schedule of Debt Outstanding (Parenthetical) (Detail) - USD ($)		6 Months Ended
	Jul. 31, 2015	Jun. 30, 2015	Dec. 31, 2014
Senior Notes 4.625% Due 2023
Debt Instrument [Line Items]
Interest rate stated percentage of Senior Notes		4.625%
Note maturity date		May 01, 2023
Senior Notes interest payable dates		interest payable semi-annually in May and November at 4.625%.
Senior Notes 4.125% Due 2020
Debt Instrument [Line Items]
Interest rate stated percentage of Senior Notes		4.125%
Note maturity date		Apr. 01, 2020
Senior Notes interest payable dates		interest payable semi-annually in April and October at 4.125%.
Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility maximum borrowing capacity		$ 900,000,000	$ 900,000,000
Revolving Credit Facility maturity date		Dec. 31, 2017
Weighted average rate		2.00%	1.90%
Senior Notes interest payable dates		interest payable periodically at variable interest rates.
Subsequent Event \| Revolving Credit Facility \| Extended Maturity
Debt Instrument [Line Items]
Revolving Credit Facility maturity date	Jul. 31, 2020