Acquisitions and Divestitures - Pro Forma (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended																12 Months Ended
	Jul. 31, 2014		Apr. 30, 2014		Jan. 31, 2014		Oct. 31, 2013		Jul. 31, 2013		Apr. 30, 2013		Jan. 31, 2013		Oct. 31, 2012		Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Business Acquisition [Line Items]
Interest Expense																	$ 14,300	$ 16,641	$ 19,090
Income tax expense (benefit)																	(4,963)	42,583	37,162
Net sales	316,733		309,577		291,194		307,530		310,592		302,483		272,702		272,015		1,225,034	1,157,792	1,071,504
Net sales, pro forma																		1,226,217	1,241,372
Income (Loss) from Continuing Operations Attributable to Parent	(96,981)		20,183		10,517		18,135		(175,557)		21,680		(10,671)		26,291		(48,146)	(138,257)	103,493
(Loss) earnings from continuing operations, pro forma																		(133,957)	104,014
Basic net (loss) income per Class A Common Share, pro forma (USD per share)																		$ (2.61)	$ 1.98
Diluted net (loss) income per Class A Common Share, pro forma (USD per share)																		$ (2.61)	$ 1.96
Amortization of Intangible Assets																	17,871	17,148	10,576
Nonvoting Common Stock [Member]
Business Acquisition [Line Items]
Income (Loss) from Continuing Operations Attributable to Parent																	$ (48,238)	$ (138,495)	$ 103,264
(Loss) earnings from continuing operations, per basic share	$ (1.89)	[1]	$ 0.39	[1]	$ 0.20	[1]	$ 0.35	[1]	$ (3.40)	[1]	$ 0.42	[1]	$ (0.21)	[1]	$ 0.51	[1]	$ (0.93)	$ (2.70)	$ 1.97
(Loss) earnings from continuing operations, per diluted share	$ (1.89)	[1]	$ 0.39	[1]	$ 0.20	[1]	$ 0.35	[1]	$ (3.40)	[1]	$ 0.42	[1]	$ (0.21)	[1]	$ 0.51	[1]	$ (0.93)	$ (2.70)	$ 1.95

[1] *** The sum of the quarters does not equal the year-to-date total for fiscal 2014 and fiscal 2013 due to the quarterly changes inweighted-average shares outstanding.