Net Income per Share - Reconciliation of Weighted Average Common Shares Used to Calculate Basic Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	6 Months Ended
Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016
Earnings Per Share [Abstract]
Net income	$ 53,306	$ 69,376	$ 139,894	$ 129,411
Weighted-average common shares for basic net income per share (shares)	150,384	152,250	150,583	152,609
Dilutive effect of potential common shares from equity-based compensation (shares)	4,477	2,286	4,171	2,312
Weighted-average common shares for diluted net income per share (shares)	154,861	154,536	154,754	154,921
Basic (in USD per share)	$ 0.35	$ 0.46	$ 0.93	$ 0.85
Diluted (in USD per share)	$ 0.34	$ 0.45	$ 0.90	$ 0.84
Anti-dilutive employee stock-based awards excluded (shares)	948	2,886	738	2,649

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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