Stock-Based Benefit Plans (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2014	Apr. 30, 2013	Oct. 31, 2013	Dec. 20, 2013	Jan. 29, 2013
Performance-Based Restricted Stock Units
Stock based expense recognized	$ 4,625	$ 4,343	$ 12,294	$ 10,027
Performance Based Restricted Stock Units [Member]
Performance-Based Restricted Stock Units
Issuance of restricted stock and stock units, shares			284,037	302,511
Closing price of the Company's common stock on date of issuance						$ 35.16	$ 37.78
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures			9,987		11,429
Stock based expense recognized	2,382	2,074	4,453	2,588
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	956,725		956,725		672,687
Unamortized value of RSUs	$ 13,653		$ 13,653		$ 8,120