Acquisitions (Summary Of Fair Values Of Identifiable Assets Acquired And Liabilities Assumed) (Details) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2012
Acquisitions [Abstract]
Accounts receivable, net	$ 2,499
Inventory, net	1,894
Other assets	1,422
Property, plant and equipment	9,612
Deferred income tax assets, net	15,087
Intangible Assets	2,470
Goodwill	85,446
Total identifiable assets acquired	118,430
Accounts payable and accrued liabilities	6,671
Deferred revenue	5,281
Capital lease obligations	2,892
Unfavorable lease obligations, net	43,400
Total liabilities assumed	58,244
Total purchase price	$ 60,186