Annual report pursuant to Section 13 and 15(d)

Commitments and contingencies

v3.5.0.2
Commitments and contingencies
12 Months Ended
Sep. 30, 2016
Commitments and Contingencies Disclosure [Abstract]  
Commitments and contingencies
Commitments and contingencies
Performance bonds
Certain contracts require us to provide a surety bond as a guarantee of performance. At September 30, 2016, we had performance bond commitments totaling $23.0 million. These bonds are typically renewed annually and remain in place until the contractual obligations have been satisfied. Although the triggering events vary from contract to contract, in general we would only be liable for the amount of these guarantees in the event of default in our performance of our obligations under each contract, the probability of which we believe is remote.
Operating Leases
We lease office space and equipment under various operating leases. Lease expense for the years ended September 30, 2016, 2015 and 2014 was $75.4 million, $67.1 million and $61.8 million, respectively. Sublease income for the year ended September 30, 2016 was $1.1 million. Our operating leases may contain rent escalations or concessions. Lease expense is recorded on a straight-line basis over the life of the respective lease.
Minimum future lease commitments under leases in effect as of September 30, 2016 are as follows (in thousands):
 
Office space
 
Equipment
 
Total
Year ending September 30,
 

 
 

 
 

2017
$
66,200

 
$
4,475

 
$
70,675

2018
46,185

 
3,779

 
49,964

2019
34,604

 
3,137

 
37,741

2020
20,670

 
1,910

 
22,580

2021
4,089

 
13

 
4,102

Thereafter
2,330

 
2

 
2,332

Total minimum lease payments
$
174,078

 
$
13,316

 
$
187,394



We anticipate future sublease income of $1.2 million per fiscal year through fiscal year 2020.
Collective bargaining agreements
Approximately 16% of our employees are covered by collective bargaining agreements or similar arrangements.