Commitments and Contingencies - Operating Lease - General Information (Details) - ft²	Mar. 31, 2016	Mar. 31, 2014
Office space in Dallas, Texas
Operating Leases
Approximate size of office space (in square feet)		2,418
Facility for corporate headquarters Bannockburn, Illinois
Operating Leases
Approximate size of office space (in square feet)		15,668
Facility in Columbus, Ohio
Operating Leases
Approximate size of office space (in square feet)		1,318
Office and warehouse space in Libertyville, Illinois
Operating Leases
Approximate size of office space (in square feet)	48,529