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3% Convertible Senior Notes (Details) (USD $)	3 Months Ended	6 Months Ended
	Jul. 31, 2009	Jan. 31, 2014
Debt Disclosure [Abstract]
Debt instrument, issuance date	May 08, 2009
Debt instrument, face amount	$ 200,000,000
Net proceeds from debt issuance	194,541,000
Aggregate amount of initial purchasers' discount and other transaction costs related to debt issuance	5,459,000
Debt instrument, interest rate, stated percentage	3.00%
Date of record		Jan. 17, 2014
Date declared		Dec. 09, 2013
Debt instrument, convertible, conversion price		$ 31.85
Debt instrument, convertible, conversion ratio		31.3953
Original principal amount of each 3.0% convertible senior note		$ 1,000
Debt instrument, call date, earliest		May 05, 2014
Debt instrument, first put date		May 01, 2014
Debt instrument, second put date		May 01, 2019
Debt instrument, third put date		May 01, 2024
Debt instrument, maturity date		May 01, 2029

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Earliest date before maturity when the issuer can call the outstanding debt instrument for repayment or conversion to equity, in CCYY-MM-DD format.

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