Supplementary Balance Sheet Information (Components Of Accounts Payable And Accrued Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2014	Jul. 31, 2013	Jan. 31, 2013
Balance Sheet Related Disclosures [Abstract]
Trade payables	$ 76,575	$ 61,364	$ 63,914
Deferred revenue	140,156	93,759	117,812
Accrued salaries, wages and deferred compensation	33,243	27,946	30,838
Accrued benefits	22,755	19,787	21,870
Deposits	32,788	14,331	26,411
Accrued interest	7,912	8,018	7,896
Other accruals	55,779	44,314	48,763
Total accounts payable and accrued liabilities	$ 369,208	$ 269,519	$ 317,504