EARNINGS (LOSS) PER SHARE CALCULATION (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2016	Apr. 30, 2015
Numerator
Net income	$ 13,997	$ 20,653	$ 2,451	$ 1,874
Add: Interest expense associated with 0.875% Convertible Senior Notes due 2017	0	1,387	0	0
Net income used to calculate Diluted EPS	$ 13,997	$ 22,040	$ 2,451	$ 1,874
Denominator
Weighted average basic common shares outstanding (in shares)	137,950	113,555	137,313	110,578
Add: Shares underlying outstanding stock options and restricted stock units and issuable under employee stock purchase plan (in shares)	939	1,354	1,380	1,184
Add: Shares underlying 0.875% Convertible Senior Notes Due 2017 (in shares)	0	13,108	0	0
Weighted average diluted common shares outstanding (in shares)	138,889	128,017	138,693	111,762
EPS
Basic EPS (in dollars per share)	$ 0.10	$ 0.18	$ 0.02	$ 0.02
Diluted EPS (in dollars per share)	$ 0.10	$ 0.17	$ 0.02	$ 0.02