Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Recurring [Member] $ in Thousands	Jul. 31, 2016 USD ($)
Assets:
Foreign currency forward contracts	$ 2,221	[1]
Total assets at fair value	2,221
Liabilities:
Deferred compensation plans	10,358	[2]
Foreign currency forward contracts	2,195	[1]
Total liabilities at fair value	12,553
Level 2 [Member]
Assets:
Foreign currency forward contracts	2,221	[1]
Total assets at fair value	2,221
Liabilities:
Deferred compensation plans	10,358	[2]
Foreign currency forward contracts	2,195	[1]
Total liabilities at fair value	$ 12,553

[1] We enter into foreign currency forward contracts to reduce the risk of foreign currency exposures resulting from receivables, payables, intercompany receivables, intercompany payables and loans denominated in foreign currencies. Foreign currency forward contracts are valued using market exchange rates. Foreign currency forward contracts are not designated as hedges.

[2] Executive officers and other highly compensated employees may defer up to 100% of their salary and annual cash incentive award and for executive officers, up to 90% of their long-term performance share incentive award, into various non-qualified deferred compensation plans. Deferrals can be allocated to various market performance measurement funds. Changes in the value of compensation deferred under these plans are recognized each period based on the fair value of the underlying measurement funds.