Acquisitions and Divestitures - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	1 Months Ended	3 Months Ended								12 Months Ended					4 Months Ended	9 Months Ended	12 Months Ended				12 Months Ended		12 Months Ended
	Jan. 31, 2013	Jul. 31, 2013	Apr. 30, 2013	Jan. 31, 2013	Oct. 31, 2012	Jul. 31, 2012	Apr. 30, 2012	Jan. 31, 2012	Oct. 31, 2011	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2011	Dec. 28, 2012	Apr. 30, 2013 Precision Dynamics Corporation [Member]	Apr. 30, 2012 Precision Dynamics Corporation [Member]	Jul. 31, 2013 Precision Dynamics Corporation [Member]	Jul. 31, 2013 Finite-lived customer relationships [Member]	Jul. 31, 2013 Trademarks [Member]	Jul. 31, 2013	Jul. 31, 2012 Grafo [Member]	Apr. 30, 2012 Grafo [Member]	Jul. 31, 2012 Runelandhs [Member]	Jul. 31, 2012 Pervaco [Member]	Jul. 31, 2011 Id Warehouse [Member]	Jul. 31, 2013 Pro Forma [Member]	Jul. 31, 2012 Pro Forma [Member]	Jul. 31, 2013 Pervaco [Member]	Jul. 31, 2013 Runelandhs [Member]	Jul. 31, 2013 Grafo [Member]	Jul. 31, 2013 Expected tax deduction [Member]
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]
Acquired Indefinite-lived Intangible Asset, Amount						$ 6,878						$ 6,878	$ 487										$ 5,340	$ 1,538
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period																					3,000		19,000	6,000
Goodwill, Acquired During Period											170,180	22,844													4,792			8,440	13,177	1,227
Notes Payable																				11,613
Proceeds from sale of operations											10,178	856	12,980
Loss (gain) on sales of businesses											(3,138)	(204)	4,394
Net sales		309,097	300,971	271,175	270,866	269,089	271,151	255,052	273,396		1,152,109	1,068,688	1,059,355				102,329
Net (loss) income, as reported											(154,535)	(17,911)	108,652		759
Assets, fair value adjustment		16,788									16,788					1,530	1,530
Proceeds from borrowing on notes payable											220,000	0	0
Repayment of borrowing on notes payable											181,000	0	0
Expected completion of valuation	12
Customer relationships						8,903						8,903	1,846	102,500								961	5,474	2,468	1,846
Finite-Lived Intangible Asset, Useful Life										7 years								10 years	3 years
Finite-Lived Trade Names, Gross														6,800
Goodwill		170,180				22,844					170,180	22,844	4,792
Business Combination, Acquisition Related Costs																3,600	3,600
Interest Expense											16,641	19,090	22,124			1,402	529
Income tax expense (benefit)																2,526	429
Amortization of Intangible Assets											17,148	10,576	15,571													5,215	12,517
Business Acquisition, Cost of Acquired Entity, Purchase Price																						3,039	22,499	12,111	7,970
Finite-Lived Noncompete Agreements, Gross						186						186											95	91	487
Business Acquisition, Purchase Price Allocation, Goodwill, Expected Tax Deductible Amount		57,374									57,374
Business Acquisition, Purchase Price Allocation, Intangible Assets Other than Goodwill																															51,672
Other intangible assets		$ 109,300									$ 109,300