Commitments, Contingencies and Other Matters (Narrative) (Detail) In Thousands, unless otherwise specified				3 Months Ended					12 Months Ended
	Sep. 30, 2013 Entity	Sep. 30, 2013 Rising Pharmaceuticals Inc. [Member] USD ($)	Jun. 30, 2013 Rising Pharmaceuticals Inc. [Member] USD ($)	Sep. 30, 2013 United Phosphorous Limited [Member] USD ($)	Sep. 30, 2013 United Phosphorous Limited [Member] GBP (£)	Sep. 30, 2013 Pulvair Site Group [Member] USD ($)	Sep. 30, 2013 Arsynco Inc. [Member] USD ($)	Jun. 30, 2013 Arsynco Inc. [Member] USD ($)	Jun. 30, 2009 BASF Corporation [Member] USD ($)	Sep. 30, 2013 BASF Corporation [Member] USD ($)	Jun. 30, 2013 BASF Corporation [Member] USD ($)	Sep. 30, 2013 Subsidiary [Member] USD ($)
Commitments and Contingencies Disclosure [Line Items]
Loss contingency, damages sought				$ 7,200	£ 4,500	$ 1,700
Site contingency loss exposure not accrued, low estimate							9,000
Site contingency loss exposure not accrued, high estimate							10,800
Accrual for environmental loss contingencies							6,673	7,166
Partial reimbursement of environmental remediation costs previously expensed									550
Environmental remediation costs expensed in prior years									1,200
Future remediation costs receivable										3,003	3,225
Number of potentially responsible parties	150
Amount expected to be paid for product registrations and various task force groups												4,501
Earnings before Interest taxes, depreciation and amortization		32,100
Contingent consideration, maximum		6,000
Contingent consideration at fair value		$ 5,473	$ 5,346