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Amount of liability recognized arising from contingent consideration in a business combination.

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Acquisitions (Narratives) (Details) - USD ($)	3 Months Ended			6 Months Ended
Acquisitions (Narratives) (Details) - USD ($)	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2016	Sep. 30, 2015	Mar. 31, 2017	Jul. 15, 2016	Mar. 31, 2016
Business Acquisition [Line Items]
Stated interest rate percentage	7.875%			7.875%
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 677,000			$ 677,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life				17 years
Restricted Cash and Cash Equivalents, Current	294,000			$ 294,000
Restricted Cash and Cash Equivalents, Noncurrent	294,000			294,000
Business Combination, Contingent Consideration, Liability						$ 5,431,000
Business Acquisition, Period Results Included in Combined Entity	12,619,000	$ 6,512,000		23,820,000	$ 17,803,000
Line of Credit Facility, Maximum Borrowing Capacity	75,000,000			75,000,000
Repayments of Lines of Credit	61,000,000
Goodwill	170,404,000			170,404,000				$ 170,716,000
Ergomatic Products LLC [Member]
Business Acquisition [Line Items]
Working capital	212,000			212,000
Long-Lived Assets	246,000			246,000
Intangible Assets, Gross (Excluding Goodwill)	717,000			717,000
Business Combination, Consideration Transferred, Other				$ 1,175,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life				20 years
Restricted Cash and Cash Equivalents, Noncurrent							$ 587,000
Business Acquisition Purchase Price Allocation Total Allocated	1,175,000			$ 1,175,000
Escrow Deposit	588,000			588,000
STB [Member]
Business Acquisition [Line Items]
Restricted Cash and Cash Equivalents, Current						822,000
Restricted Cash and Cash Equivalents, Noncurrent						$ 4,609,000
Revenues			$ 16,000,000
Other Current Liabilities [Member]
Business Acquisition [Line Items]
Escrow Deposit	294,000			294,000
Other Noncurrent Liabilities [Member]
Business Acquisition [Line Items]
Escrow Deposit	294,000			$ 294,000
Customer relationships
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life				17 years
Maximum [Member]
Business Acquisition [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 225,000,000			$ 225,000,000
Subordinated Debt [Member]
Business Acquisition [Line Items]
Stated interest rate percentage