Significant Accounting Policies 2 (Details)	12 Months Ended
	Mar. 31, 2018
Internally Developed Software Products
Finite-Lived Intangible Assets
Finite-lived intangible assets, Estimated useful life (in years)	5 years
Purchased Software Products | Minimum
Finite-Lived Intangible Assets
Finite-lived intangible assets, Estimated useful life (in years)	1 year
Purchased Software Products | Maximum
Finite-Lived Intangible Assets
Finite-lived intangible assets, Estimated useful life (in years)	10 years
Other Intangible Assets | Minimum
Finite-Lived Intangible Assets
Finite-lived intangible assets, Estimated useful life (in years)	1 year
Other Intangible Assets | Maximum
Finite-Lived Intangible Assets
Finite-lived intangible assets, Estimated useful life (in years)	15 years