SEGMENT AND GEOGRAPHIC INFORMATION Product Revenues By The Three Product Lines (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 product_line	Mar. 31, 2013
Revenue from External Customers [Line Items]
Number Of Product Lines			3
Product revenues	$ 24,869	$ 24,689	$ 49,732	$ 48,594
Connectivity [Member]
Revenue from External Customers [Line Items]
Product revenues	10,475	9,835	19,424	19,973
Ethernet switching [Member]
Revenue from External Customers [Line Items]
Product revenues	11,618	10,331	22,954	18,637
Transport processing [Member]
Revenue from External Customers [Line Items]
Product revenues	$ 2,776	$ 4,523	$ 7,354	$ 9,984