Commitments and Contingencies (Details) (Office space in Bedford, Massachusetts, USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Sep. 30, 2014	Jun. 30, 2014
Commitments and Contingencies
Number of successive five-year terms for which the lease may be extended		2
Extension period of lease term		5 years
Future minimum non-cancelable lease payments	$ 35.7
Aggregate capital expenditures with respect to the leased premises	8.4
Contractual obligations	7.3
Capital expenditures	3.1
Contractual obligations related to the new facility capital expenditures are expected to be made in fiscal 2015	$ 4.2
Lease term commencing on November 1, 2014
Commitments and Contingencies
Area of Real Estate Property		105,874
Initial term of lease		10 years 5 months
Lease term commencing on February 1, 2015
Commitments and Contingencies
Area of Real Estate Property		36,799