Segment Information - Schedule of Revenues and Long-Lived Assets by Geographic Location (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	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, 2013	Jul. 31, 2012	Jul. 31, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]
Disclosure on Geographic Areas, Long-Lived Assets in Entity's Country of Domicile	$ 896,245				$ 890,925				$ 896,245	$ 890,925	$ 1,030,219
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
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Disclosure on Geographic Areas, Revenue from External Customers Attributed to Entity's Country of Domicile									615,861	522,393	497,030
Disclosure on Geographic Areas, Long-Lived Assets in Entity's Country of Domicile	576,539				479,791				576,539	479,791	488,571
OtherCountries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Disclosure on Geographic Areas, Revenue from External Customers Attributed to Entity's Country of Domicile									596,899	609,083	623,839
Disclosure on Geographic Areas, Long-Lived Assets in Entity's Country of Domicile	319,706				411,134				319,706	411,134	541,648
Intersegment Elimination [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Disclosure on Geographic Areas, Revenue from External Customers Attributed to Entity's Country of Domicile									(60,651)	(62,788)	(61,514)
Disclosure on Geographic Areas, Long-Lived Assets in Entity's Country of Domicile	$ 0				$ 0				$ 0	$ 0	$ 0