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Share Based Awards (Details 1)
3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2015
Schedule of Share Based Compensation Valuation Assumption    
Expected life 4 years 10 months 24 days 5 years 0 months 12 days
Expected volatility 43.40%qsii_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRangeOfExpectedDividendRate 41.30%qsii_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRangeOfExpectedDividendRate
Expected Dividends 3.10%qsii_ShareBasedCompensationByShareBasedPaymentAwardExpectedDividendsRange 2.40%qsii_ShareBasedCompensationByShareBasedPaymentAwardExpectedDividendsRange
Risk-free rate 1.00%qsii_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsOfRangeOfRiskFreeInterestRate 0.70%qsii_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsOfRangeOfRiskFreeInterestRate
Maximum [Member]    
Schedule of Share Based Compensation Valuation Assumption    
Expected volatility 43.70%qsii_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRangeOfExpectedDividendRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
45.10%qsii_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRangeOfExpectedDividendRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Expected Dividends 3.90%qsii_ShareBasedCompensationByShareBasedPaymentAwardExpectedDividendsRange
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
4.00%qsii_ShareBasedCompensationByShareBasedPaymentAwardExpectedDividendsRange
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Risk-free rate 1.50%qsii_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsOfRangeOfRiskFreeInterestRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
0.80%qsii_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsOfRangeOfRiskFreeInterestRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember