Schedule of Accounts Payable and Accrued Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2014	Jul. 31, 2014	Oct. 31, 2013
Balance Sheet Items [Abstract]
Accounts payable	$ 83,178	$ 64,673	$ 88,703
Securities settlement	0	0	119,625
Accrued promotions	25,934	22,638	28,881
Accrued salaries and benefits	10,615	13,364	10,512
Accrued taxes	4,942	4,706	8,043
Accrued interest	2,222	7,336	883
Accrued current lease obligations	2,661	2,620	2,406
Other	2,909	2,340	2,439
Total	$ 132,461	$ 117,677	$ 261,492