Intangible Assets and Goodwill (Details 2) (USD $)	9 Months Ended	12 Months Ended		9 Months Ended	12 Months Ended	9 Months Ended					9 Months Ended	12 Months Ended
Apr. 30, 2013	Jul. 31, 2012	Jul. 31, 2012 Endoscopy	Apr. 30, 2013 Endoscopy	Apr. 30, 2013 Water Purification and Filtration	Jul. 31, 2012 Water Purification and Filtration	Apr. 30, 2013 Healthcare Disposables	Jul. 31, 2011 Healthcare Disposables	Apr. 30, 2013 Dialysis	Jul. 31, 2012 Dialysis	Jul. 31, 2011 Dialysis	Apr. 30, 2013 All Other	Jul. 31, 2012 All Other	Apr. 30, 2013 Specialty Packaging segment	Jul. 31, 2012 Specialty Packaging segment
Changes in Goodwill
Balance at the beginning of the period	$ 183,655,000	$ 134,770,000	$ 9,648,000	$ 59,230,000	$ 51,765,000	$ 52,074,000	$ 55,864,000	$ 55,864,000	$ 8,133,000	$ 8,133,000	$ 8,133,000	$ 8,663,000	$ 9,051,000	$ 7,110,000
Acquisitions	24,574,000	49,582,000	49,582,000		597,000		23,977,000
Foreign currency translation	(53,000)	(697,000)			(24,000)	(309,000)						(29,000)	(388,000)
Balance at the end of the period	$ 208,176,000	$ 183,655,000	$ 59,230,000	$ 59,230,000	$ 52,338,000	$ 51,765,000	$ 79,841,000	$ 55,864,000	$ 8,133,000	$ 8,133,000	$ 8,133,000	$ 8,634,000	$ 8,663,000	$ 7,110,000
Average fair value exceeding book value (as a percent)										19.00%					24.00%
Assumed compounded annual sales growth impacting the impairment assessments (as a percent)														14.00%

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

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-URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 34

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 43

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

-Subparagraph e

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 72

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

The aggregate amount of goodwill acquired in the period and allocated to the reportable segment. The value is stated at fair value based on the purchase price allocation.

+ References+ Details