Acquisitions and Divestitures - Pro Forma (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Oct. 31, 2013	Oct. 31, 2012
Business Acquisition [Line Items]
Interest Expense	$ 3,721	$ 4,163
Income tax expense	8,449	13,077
Net sales	305,974	270,866
Net sales, pro forma	305,974	312,916
Income (Loss) from Continuing Operations Attributable to Parent	17,423	25,785
Earnings from continuing operations, pro forma	17,423	26,689
Basic net (loss) income per Class A Common Share, pro forma (USD per share)	$ 0.33	$ 0.52
Diluted net (loss) income per Class A Common Share, pro forma (USD per share)	$ 0.33	$ 0.52
Amortization of Intangible Assets	5,077	4,147
Nonvoting Common Stock [Member]
Business Acquisition [Line Items]
Income (Loss) from Continuing Operations Attributable to Parent	$ 17,378	$ 25,726
Income (Loss) from Continuing Operations, Per Basic Share	$ 0.33	$ 0.50
Income (Loss) from Continuing Operations, Per Diluted Share	$ 0.33	$ 0.50