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Subsequent Events
6 Months Ended
Mar. 31, 2017
Subsequent Events [Abstract]  
Subsequent Events
Subsequent Events
On May 3, 2017, the Company entered into an agreement to lease approximately 515,000 square feet of office space in Seattle, Washington that will serve as its new corporate headquarters. The initial term of the lease is 14.5 years and is expected to commence on the latter of (i) April 1, 2019 or (ii) 10 months after the substantial completion date of the construction of the Premises.