SCHEDULE II (Detail) - Schedule Of Valuation and Qualifying Accounts (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Bad Debts [Member] | Allowance for Doubtful Accounts [Member]
Balance at Beginning of Year	$ 4,610	$ 5,091	$ 3,138
Acquired By Purchase	0	0	521
Recorded to Cost and Expense	2,009	1,121	2,431
Accounts Written Off, net	(2,284)	(1,405)	(996)
Other	(189)	(197)	(3)
Balance at End of Year	4,146	4,610	5,091
Allowance for Doubtful Accounts Sales Returns And Allowances [Member] | Allowance for Doubtful Accounts [Member]
Balance at Beginning of Year	1,462	1,490	1,319
Acquired By Purchase	0	0	0
Recorded to Cost and Expense	2,018	2,741	430
Accounts Written Off, net	(2,160)	(2,748)	(258)
Other	(33)	(21)	(1)
Balance at End of Year	1,287	1,462	1,490
Allowance for Doubtful Accounts [Member]
Balance at Beginning of Year	6,072	6,581	4,457
Acquired By Purchase	0	0	521
Recorded to Cost and Expense	4,027	3,862	2,861
Accounts Written Off, net	(4,444)	(4,153)	(1,254)
Other	(222)	(218)	(4)
Balance at End of Year	5,433	6,072	6,581
Inventory Valuation Reserve [Member]
Balance at Beginning of Year	13,897	13,141	11,178
Acquired By Purchase	0	0	1,187
Recorded to Cost and Expense	26,624	27,361	4,904
Accounts Written Off, net	(23,002)	(26,474)	(4,017)
Other	(552)	(131)	(111)
Balance at End of Year	16,967	13,897	13,141
Valuation Allowance of Deferred Tax Assets [Member]
Balance at Beginning of Year	9,481	13,977	4,726
Acquired By Purchase	0	0	8,879
Recorded to Cost and Expense	(2,046)	(4,496)	372
Accounts Written Off, net	0	0	0
Other	0	0	0
Balance at End of Year	$ 7,435	$ 9,481	$ 13,977