Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (Recurring [Member], USD $) In Thousands, unless otherwise specified	Jul. 31, 2014
Assets:
Rabbi trust	$ 13,550
Foreign currency forward contracts	3,688
Total assets at fair value	17,238
Liabilities:
Deferred compensation plans	8,494
Foreign currency forward contracts	3,966
Total liabilities at fair value	12,460
Level 1 [Member]
Liabilities:
Deferred compensation plans	8,494
Foreign currency forward contracts	0
Total liabilities at fair value	8,494
Level 2 [Member]
Assets:
Rabbi trust	13,550
Foreign currency forward contracts	3,688
Total assets at fair value	17,238
Liabilities:
Deferred compensation plans	0
Foreign currency forward contracts	3,966
Total liabilities at fair value	$ 3,966