CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
Net sales	$ 122,719us-gaap_SalesRevenueNet	$ 128,589us-gaap_SalesRevenueNet	$ 245,106us-gaap_SalesRevenueNet	$ 249,778us-gaap_SalesRevenueNet
Cost of goods sold	77,322us-gaap_CostOfGoodsSold	82,253us-gaap_CostOfGoodsSold	157,082us-gaap_CostOfGoodsSold	162,134us-gaap_CostOfGoodsSold
Gross profit	45,397us-gaap_GrossProfit	46,336us-gaap_GrossProfit	88,024us-gaap_GrossProfit	87,644us-gaap_GrossProfit
Selling, general, and administrative expenses	24,490	27,728	48,589	53,121
Research and development expenses	9,710us-gaap_ResearchAndDevelopmentExpense	11,559us-gaap_ResearchAndDevelopmentExpense	20,326us-gaap_ResearchAndDevelopmentExpense	23,099us-gaap_ResearchAndDevelopmentExpense
Amortization expense	751us-gaap_AmortizationOfIntangibleAssets	664us-gaap_AmortizationOfIntangibleAssets	1,535us-gaap_AmortizationOfIntangibleAssets	1,355us-gaap_AmortizationOfIntangibleAssets
Income from operations	10,446us-gaap_OperatingIncomeLoss	6,385us-gaap_OperatingIncomeLoss	17,574us-gaap_OperatingIncomeLoss	10,069us-gaap_OperatingIncomeLoss
Other (income) expense
Interest income	(110)us-gaap_InvestmentIncomeInterest	(134)us-gaap_InvestmentIncomeInterest	(200)us-gaap_InvestmentIncomeInterest	(258)us-gaap_InvestmentIncomeInterest
Interest expense	95us-gaap_InterestExpense	101us-gaap_InterestExpense	176us-gaap_InterestExpense	512us-gaap_InterestExpense
Foreign currency (income) expense	(1,975)	798	(3,279)	959
Other (income) expense	85us-gaap_OtherNonoperatingIncomeExpense	(988)us-gaap_OtherNonoperatingIncomeExpense	118us-gaap_OtherNonoperatingIncomeExpense	(1,237)us-gaap_OtherNonoperatingIncomeExpense
Income before income tax	12,351	6,608	20,759	10,093
Income tax expense	3,603us-gaap_IncomeTaxExpenseBenefit	2,113us-gaap_IncomeTaxExpenseBenefit	5,840us-gaap_IncomeTaxExpenseBenefit	3,347us-gaap_IncomeTaxExpenseBenefit
Net income	8,748us-gaap_ProfitLoss	4,495us-gaap_ProfitLoss	14,919us-gaap_ProfitLoss	6,746us-gaap_ProfitLoss
Less: Net income attributable to the non-controlling interest	11	6	15	47
Net income attributable to RSTI	$ 8,737us-gaap_NetIncomeLoss	$ 4,489us-gaap_NetIncomeLoss	$ 14,904us-gaap_NetIncomeLoss	$ 6,699us-gaap_NetIncomeLoss
Net income attributable to RSTI per share:
Per share of common stock basic	$ 0.31us-gaap_EarningsPerShareBasic	$ 0.16us-gaap_EarningsPerShareBasic	$ 0.53us-gaap_EarningsPerShareBasic	$ 0.24us-gaap_EarningsPerShareBasic
Per share of common stock diluted	$ 0.31us-gaap_EarningsPerShareDiluted	$ 0.16us-gaap_EarningsPerShareDiluted	$ 0.53us-gaap_EarningsPerShareDiluted	$ 0.24us-gaap_EarningsPerShareDiluted
Weighted-average shares used in computing earnings per share (Note 12)
Basic (shares)	28,113,807	28,116,693	28,080,589	28,132,038
Diluted (shares)	28,243,878	28,272,005	28,224,091	28,301,366

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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-URI http://asc.fasb.org/extlink&oid=6386349&loc=d3e3636-108311

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- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References

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- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Weighted-Average Number of Common Shares Outstanding

-URI http://asc.fasb.org/extlink&oid=6528421

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