Income Tax (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Deferred tax assets:
Deferred revenue	$ 11,970us-gaap_DeferredTaxAssetsDeferredIncome	$ 10,144us-gaap_DeferredTaxAssetsDeferredIncome
Inventory valuation	56us-gaap_DeferredTaxAssetsInventory	46us-gaap_DeferredTaxAssetsInventory
Accrued compensation and benefits	7,744	5,219
Deferred compensation	2,342	1,941
Compensatory stock option expense	2,852	2,094
Allowance for doubtful accounts	4,944	6,791
Intangible assets	7,603	6,086
Research and development credit	1,988	2,434
Deferred Tax Assets, Operating Loss Carryforwards, Domestic	512	0
Other	3,561us-gaap_DeferredTaxAssetsOther	2,992us-gaap_DeferredTaxAssetsOther
Total deferred tax assets	43,572us-gaap_DeferredTaxAssetsGross	37,747us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities:
Accelerated depreciation	(756)	(1,582)
Capitalized software	(8,728)	(13,919)
Prepaid expense	(1,321)	(1,199)
State income taxes	(730)qsii_DeferredTaxLiabilitiesStateTaxes	(433)qsii_DeferredTaxLiabilitiesStateTaxes
Total deferred tax liabilities	(11,535)us-gaap_DeferredTaxLiabilities	(17,133)us-gaap_DeferredTaxLiabilities
Valuation allowance	(1,840)	(2,288)
Deferred tax assets (liabilities), net	$ 30,197us-gaap_DeferredTaxAssetsLiabilitiesNet	$ 18,326us-gaap_DeferredTaxAssetsLiabilitiesNet

Deferred tax assets tax deferred expense compensation and benefits employee compensation and benefits .

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Deferred tax liabilities accelerated depreciation .

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Deferred Tax Liabilities, State Taxes

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from deferred income.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from intangible assets including goodwill.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from inventory.

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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, before jurisdictional netting.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences not separately disclosed.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible research tax credit carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences, before jurisdictional netting.

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Amount of deferred tax liability attributable to taxable temporary differences from capitalized software.

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Amount of deferred tax consequences attributable to taxable temporary differences derived from prepaid expenses.

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