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Interest Rate Swap Agreements - Summary of variable rates received and fixed rates paid under swap (Details 1) - Interest Rate Swap	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Derivative [Line Items]
Variable rate received	1.22%	0.50%	1.05%	0.47%
Fixed rate paid	0.87%	0.94%	0.91%	0.94%

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- Definition

Average fixed interest rate related to the group of interest rate derivatives.

+ References

No definition available.

+ Details

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- Definition

Average variable interest rate related to the group of interest rate derivatives.

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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