Segment Information (Financial Information For Each Reportable Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended																12 Months Ended
	Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2011		Sep. 30, 2013 segment		Sep. 30, 2012		Sep. 30, 2011
Segment Reporting Information [Line Items]
Number of reportable segments																	3
Revenues	$ 39,857		$ 36,580		$ 37,082		$ 36,681		$ 37,432		$ 39,205		$ 39,094		$ 36,669		$ 150,200		$ 152,400		$ 120,458
Operating income (loss)	7,015	[1]	(16,776)	[1]	7,154	[1]	6,727	[1]	1,219	[1]	9,249	[1]	10,149	[1]	7,553	[1]	4,120	[1],[2]	28,170	[1]	34,883
Depreciation and amortization																	14,924	[3]	11,631	[3]	7,991	[3]
Goodwill impairment charge			22,700														22,700	[3]
Radiation Measurement [Member]
Segment Reporting Information [Line Items]
Revenues																	109,836		107,922		99,868
Operating income (loss)																	39,319	[2]	43,775		48,208
Depreciation and amortization																	11,180		8,377		7,032
Medical Physics [Member]
Segment Reporting Information [Line Items]
Revenues																	30,859		30,937		20,590
Operating income (loss)																	3,507	[2]	1,334		(490)
Depreciation and amortization																	1,185		1,419		959
Medical Products [Member]
Segment Reporting Information [Line Items]
Revenues																	9,505		13,541
Operating income (loss)																	(21,828)	[2]	5,297
Depreciation and amortization																	2,559		1,835
Corporate [Member]
Segment Reporting Information [Line Items]
Operating income (loss)																	$ (16,878)	[2]	$ (22,236)		$ (12,835)

[1] Third quarter of fiscal 2013 includes a $22,700 impairment charge. The fourth quarter of fiscal 2013 includes correction of certain errors relating to prior periods.  The corrections decreased operating income by approximately $350 and increased equity in income of joint ventures by approximately $300. The Company does not believe these corrections were material to any current or prior interim or annual periods that were affected.

[2] Fiscal 2013 includes $22,700 impairment charge.

[3] Restated